critical literature review phrases

17 strong academic phrases to write your literature review (+ real examples)

A well-written academic literature review not only builds upon existing knowledge and publications but also involves critical reflection, comparison, contrast, and identifying research gaps. The following 17 strong academic key phrases can assist you in writing a critical and reflective literature review.

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Academic key phrases to present existing knowledge in a literature review

Academic key phrases to contrast and compare findings in a literature review, academic key phrases to highlight research gaps in a literature review, the topic has received significant interest within the wider literature..

Example: “ The topic of big data and its integration with AI has received significant interest within the wider literature .” ( Dwivedi et al. 2021, p. 4 )

The topic gained considerable attention in the academic literature in…

Example:  “ The relationship between BITs and FDI gained considerable attention in the academic literature in the last two decades .” ( Amendolagine and Prota, 2021, p. 173 )

Studies have identified…

Example: “ Studies have identified the complexities of implementing AI based systems within government and the public sector .” ( Dwivedi et al. 2021, p. 6 )

Researchers have discussed…

Example: “ Researchers have discussed the ethical dimensions of AI and implications for greater use of the technology. ” ( Dwivedi et al. 2021, p. 6)

Recent work demonstrated that…

Example: “Recent work demonstrated that dune grasses with similar morphological traits can build contrasting landscapes due to differences in their spatial shoot organization.” ( Van de Ven, 2022 et al., p. 1339 )

Existing research frequently attributes…

Example:  “Existing research frequently attributes these challenges to AI’s technical complexity, demand for data, and unpredictable interactions.” ( Yang et al., 2020, p. 174 )

Prior research has hypothesized that…

Example:  “Prior research has hypothesized that racial and ethnic disparities may be mitigated if the patient and provider share the same race due to improved communication and increased trust” ( Otte, 2022, p. 1 )

Prior studies have found that…

Example:  “ Prior studies have found that court-referred individuals are more likely to complete relationship violence intervention programs (RVIP) than self-referred individuals. ” ( Evans et al. 2022, p. 1 )

You may also like: 26 powerful academic phrases to write your introduction (+ real examples)

While some scholars…, others…

Example: “On the sustainable development of microcredit, some scholars emphasize the effect of its poverty alleviation, while some scholars emphasize the factors such as institutional innovation and government support.” ( Huang et al., 2021, p. 2117 )

The findings of Scholar A showcase that… . Scholar B , on the other hand, found…

Example: “ The findings of Arinto (2016) call for administrators concerning the design of faculty development programs, provision of faculty support, and strategic planning for online distance learning implementation across the institution. Francisco and Nuqui (2020) on the other hand found that the new normal leadership is an adaptive one while staying strong on their commitment. ” ( Asio and Bayucca, 2021, p. 20 )

Interestingly, all the arguments refer to…

Example:  “Interestingly, all the arguments above refer to daily role transitions—more specifically: role transitions on teleworking days—as an important explanatory mechanism for both the possible conflict-reducing effect and the potential conflict enhancing effects of telework.”  ( Delanoeije et al., 2019, p. 1845 )

This argument is similar to…

Example: “The third argument against physician involvement in lethal injection is that physicians are prohibited from deliberately harming patients or the argument from nonmaleficence. This argument is similar to the argument from healing but has different implications and must therefore be considered independently.” ( Sawicki, 2022, p. 22 )

If you are looking to elevate your writing and editing skills, I highly recommend enrolling in the course “ Good with Words: Writing and Editing Specialization “, which is a 4 course series offered by the University of Michigan. This comprehensive program is conveniently available as an online course on Coursera, allowing you to learn at your own pace. Plus, upon successful completion, you’ll have the opportunity to earn a valuable certificate to showcase your newfound expertise!

Yet, it remains unknown how…

Example: “Yet, it remains unknown how findings from aeolian landscapes translate to aquatic systems and how young clonally expanding plants in hydrodynamically exposed conditions overcome these establishment thresholds by optimizing shoot placement.” ( Van de Ven, 2022 et al., p. 1339 )

There is, however, still little research on…

Example:  “There is, however, still little research on what integrated STEM approaches require from schools and teachers, and on the potential obstacles that may prevent teachers from running this kind of teaching.”  ( Bungum and Mogstad, 2022, p. 2 )

Existing studies have failed to address…

Example: “ University–industry relations (UIR) are usually analysed by the knowledge transfer channels, but existing studies have failed to address what knowledge content is being transferred – impacting the technology output aimed by the partnership.”  (Dalmarco et al. 2019, p. 1314 )

Several scholars have recommended to move away…

Example: “Several scholars have recommended to move away from such a stable-level approach (i.e. using a global judgment of work-home conflict) to a dynamic episodes approach ” ( Delanoeije et al., 2019, p. 1847 )

New approaches are needed to address…

Example:  “ Accurate computational approaches are needed to address this gap and to enable large-scale structural bioinformatics. ” ( Jumper et al. 2021,p. 583 )

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Academic Phrases for Writing Literature Review Section of a Research Paper

Overview |   Abstract   | Introduction | Literature Review | Materials & Methods | Results & Discussion | Conclusion & Future Work | Acknowledgements & Appendix

The literature review should clearly demonstrate that the author has a good knowledge of the research area. Literature review typically occupies one or two passages in the introduction section. A well-written literature review should provide a critical appraisal of previous studies related to the current research area rather than a simple summary of prior works. The author shouldn’t shy away from pointing out the shortcomings of previous works. However, criticising other’s work without any basis can weaken your paper. This is a perfect place to coin your research question and justify the need for such a study. It is also worth pointing out towards the end of the review that your study is unique and there is no direct literature addressing this issue. Add a few sentences about the significance of your research and how this will add value to the body of knowledge.

The literature review section of your research paper should include the following:

• Previous literature
• Limitations of previous research
• Research questions
• Research to be explored

1. Previous literature

The literature review shows that __ Previous research showed __ Seminal contributions have been made by __ A series of recent studies has indicated that __ Several theories have been proposed to __, some focusing on __, others on __ There has been numerous studies to investigate __ This has been used in several studies to assess __ Previous studies have shown __ Several studies suggest that __ This has also been explored in prior studies by __ Prior research suggests that __ Previous studies have emphasized __ The majority of prior research has applied __ Most early studies as well as current work focus on __ For instance, the following studies were conducted on __ Studies of __are well documented, it is also well acknowledged that __ A number of authors have recognized __ Some authors have also suggested that  __ Some authors have driven the further development of __ This has been discussed by a great number of authors in literature. For example, research has provided evidence for __ The authors bring some information about the background of the problem, __ As has been previously reported in the literature, __ A large number of existing studies in the broader literature have examined __ The literature review shows that __ There exists a considerable body of literature on  __ In short, the literature pertaining to __ strongly suggests that __ Over time, an extensive literature has developed on __ This section presents a review of recent literature on __ This paper begins with a short review of the literature regarding the __ Several methods are reported in the literature to address this issue. There is a wide choice of __ available in the literature. This section reviews the literature related to __ It was reported in literature that __ A recent study by __ concluded that __ In the light of reported __ it is conceivable that __ The method introduced by __ has the advantage that __ One method employed by __ is __ A more comprehensive description can be found in __ For example, recent research suggests that __ This was successfully established as described by __ The author employed a __ methodology which prescribes the use of __

2. Limitations of previous research

A number of questions regarding __ remain to be addressed. A closer look to the literature on __, however, reveals a number of gaps and shortcomings. This question has previously never been addressed because__ Most studies have relied on __ Previous studies by __ cannot be considered as conclusive because __ Previous studies have almost exclusively focused on __ This has been previously assessed only to a very limited extent because __ In the present studies __ were constrained to __ In previous studies were limited to __ Although results appear consistent with prior research, they appear inconsistent with __ These are previously unstudied because __ As far as we know, no previous research has investigated __ Moreover, although research has illuminated __ no study to date has examined __ Despite decades of research, this continues to be debated among __ This section points out some of the problems encountered in the extant research. Although there are many studies, the research in __ remains limited. However, the existing research has many problems in representing __ The literature on __ is less consistent Historically, there has been a great deal of confusion in the literature regarding __ This approach remains briefly addressed in the literature. These are rarely analyzed in the literature as __ There are key questions and notions that are still not discussed in the literature __ This is not clearly presented in the literature because __ This paper addresses the need for __, so far lacking in the scientific literature. To fill this literature gap, this paper identifies __ Only a few works in literature demonstrate __ Although studies have been conducted by many authors, this problem is still insufficiently explored. To our knowledge, no prior studies have examined __ However, the existing research has many problems in __ Therefore, important issue in the literature is __ However, we argue that previous literature suffers from certain weaknesses: __ Previous research can only be considered a first step towards a more profound understanding of __ The previous studies reveal that __ are usually the most problematic to __

3. Research questions

More specific research questions will be introduced and investigated in __ A further question is whether __ Finally, another promising line of research would be __ The study addresses several further questions on __ Some of the interesting questions in this context are __ In order to address the questions outlined above, we report here __ These questions are of central interest as much recent research in __ Furthermore, __ is arguably an important question to be addressed. The question now is how __ can be used to explain __ Study addresses the research question __ In order to properly address this question, we __ An important question associated with __ is __ A critical open question is whether __ A still unsolved question is whether __ This remains an open question as __ This question has previously never been addressed because __ This study offers a test of __ research question Study addresses the research question __ Even in general __ research strategies is needed to explain __ The researcher should be interested here in __ Many questions remain unanswered __ There are some potentially open questions about the validity of __ The question that then naturally arises is __ The question then becomes how best to define__ This was an important question to study as __

4. Research to be explored

A more systematic and theoretical analysis is required for __ As the authors note earlier, more work is necessary to__ Additional studies to understand more completely the key tenets of __ are required. The unexpected findings signal the need for additional studies to understand more about __ This paper addresses __, so far lacking in the scientific literature. A new approach is therefore needed for __ One of the tough challenges for all researchers in this domain is __

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Building a Strong Literature Review: Words and Phrases to Include

• backlinkworks
• Writing Articles & Reviews
• December 27, 2023

A literature review is an essential part of any academic paper or research project. IT provides a comprehensive overview of the existing literature on a specific topic, identifies gaps in the current knowledge, and sets the context for the research to be conducted. Building a strong literature review requires careful selection of words and phrases to ensure that IT is well-structured, informative, and persuasive. In this article, we will discuss the words and phrases that are crucial for building a strong literature review.

Words and Phrases to Include in a Literature Review

1. “According to” – This phrase is commonly used to introduce evidence from scholarly sources. For example, “According to Smith (2016), the impact of climate change on biodiversity is a pressing concern.”

2. “ IT has been argued that” – This phrase is useful for presenting different viewpoints on a topic. For example, “ IT has been argued that technological advancements have both positive and negative effects on societal well-being.”

3. “Previous research has shown” – This phrase is effective for referencing existing studies that are relevant to the research topic. For example, “Previous research has shown a strong correlation between smoking and lung cancer.”

4. “A significant body of literature” – This phrase is used to indicate the volume and depth of existing research on a particular topic. For example, “A significant body of literature exists on the psychological impact of social media use.”

5. “In line with previous studies” – This phrase is used to establish continuity with existing research findings. For example, “In line with previous studies, our results indicate a positive association between exercise and mental health.”

6. “Key findings suggest” – This phrase is useful for summarizing the main conclusions of the literature review. For example, “Key findings suggest that mindfulness meditation can improve attention and cognitive performance.”

7. “ IT is evident that” – This phrase is used to emphasize the clarity or strength of evidence supporting a particular argument. For example, “ IT is evident that socioeconomic status has a profound impact on educational outcomes.”

8. “This is consistent with the findings of” – This phrase is used to demonstrate the alignment of the current research with existing literature. For example, “This is consistent with the findings of prior studies that have highlighted the importance of early childhood education.”

9. “Existing literature has identified” – This phrase is useful for highlighting specific issues or phenomena that have been documented in prior research. For example, “Existing literature has identified a range of factors that influence consumer purchasing behavior.”

10. “This study builds upon previous research by” – This phrase is used to emphasize the novelty or contribution of the current research. For example, “This study builds upon previous research by examining the long-term effects of climate change on coastal ecosystems.”

A strong literature review is essential for providing a solid foundation for any research endeavor. By incorporating the words and phrases discussed in this article, researchers can effectively convey the relevance, scope, and depth of the existing literature on their chosen topic. Careful selection and deployment of these words and phrases can enhance the clarity, coherence, and persuasiveness of the literature review, ultimately contributing to the overall strength and quality of the research project.

What is the purpose of a literature review?

A literature review serves several purposes, including providing an overview of existing research on a specific topic, identifying gaps in the current knowledge, and setting the context for a new research study. IT also helps to demonstrate the researcher’s familiarity with and understanding of the relevant literature in their field.

How do I structure a literature review?

A literature review typically follows a structured format, including an introduction, the body of the review (organized by themes or topics), and a conclusion. IT should present a coherent and logical argument, synthesizing and critically analyzing the existing literature on the chosen topic.

What are some common mistakes to avoid in a literature review?

Common mistakes in a literature review include focusing too much on summarizing individual studies without providing critical analysis, failing to clearly articulate the relevance of the literature to the research topic, and not including a sufficient variety of sources to support the argument being made. IT is also important to avoid presenting personal opinions without backing them up with evidence from the literature.

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• What is a Literature Review? | Guide, Template, & Examples

What is a Literature Review? | Guide, Template, & Examples

Published on 22 February 2022 by Shona McCombes . Revised on 7 June 2022.

What is a literature review? A literature review is a survey of scholarly sources on a specific topic. It provides an overview of current knowledge, allowing you to identify relevant theories, methods, and gaps in the existing research.

There are five key steps to writing a literature review:

• Search for relevant literature
• Evaluate sources
• Identify themes, debates and gaps
• Outline the structure
• Write your literature review

A good literature review doesn’t just summarise sources – it analyses, synthesises, and critically evaluates to give a clear picture of the state of knowledge on the subject.

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Table of contents

Why write a literature review, examples of literature reviews, step 1: search for relevant literature, step 2: evaluate and select sources, step 3: identify themes, debates and gaps, step 4: outline your literature review’s structure, step 5: write your literature review, frequently asked questions about literature reviews, introduction.

• Quick Run-through
• Step 1 & 2

When you write a dissertation or thesis, you will have to conduct a literature review to situate your research within existing knowledge. The literature review gives you a chance to:

• Demonstrate your familiarity with the topic and scholarly context
• Develop a theoretical framework and methodology for your research
• Position yourself in relation to other researchers and theorists
• Show how your dissertation addresses a gap or contributes to a debate

You might also have to write a literature review as a stand-alone assignment. In this case, the purpose is to evaluate the current state of research and demonstrate your knowledge of scholarly debates around a topic.

The content will look slightly different in each case, but the process of conducting a literature review follows the same steps. We’ve written a step-by-step guide that you can follow below.

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Writing literature reviews can be quite challenging! A good starting point could be to look at some examples, depending on what kind of literature review you’d like to write.

• Example literature review #1: “Why Do People Migrate? A Review of the Theoretical Literature” ( Theoretical literature review about the development of economic migration theory from the 1950s to today.)
• Example literature review #2: “Literature review as a research methodology: An overview and guidelines” ( Methodological literature review about interdisciplinary knowledge acquisition and production.)
• Example literature review #3: “The Use of Technology in English Language Learning: A Literature Review” ( Thematic literature review about the effects of technology on language acquisition.)
• Example literature review #4: “Learners’ Listening Comprehension Difficulties in English Language Learning: A Literature Review” ( Chronological literature review about how the concept of listening skills has changed over time.)

You can also check out our templates with literature review examples and sample outlines at the links below.

Download Word doc Download Google doc

Before you begin searching for literature, you need a clearly defined topic .

If you are writing the literature review section of a dissertation or research paper, you will search for literature related to your research objectives and questions .

If you are writing a literature review as a stand-alone assignment, you will have to choose a focus and develop a central question to direct your search. Unlike a dissertation research question, this question has to be answerable without collecting original data. You should be able to answer it based only on a review of existing publications.

Make a list of keywords

Start by creating a list of keywords related to your research topic. Include each of the key concepts or variables you’re interested in, and list any synonyms and related terms. You can add to this list if you discover new keywords in the process of your literature search.

• Social media, Facebook, Instagram, Twitter, Snapchat, TikTok
• Body image, self-perception, self-esteem, mental health
• Generation Z, teenagers, adolescents, youth

Search for relevant sources

Use your keywords to begin searching for sources. Some databases to search for journals and articles include:

• Your university’s library catalogue
• Google Scholar
• Project Muse (humanities and social sciences)
• Medline (life sciences and biomedicine)
• EconLit (economics)
• Inspec (physics, engineering and computer science)

You can use boolean operators to help narrow down your search:

Read the abstract to find out whether an article is relevant to your question. When you find a useful book or article, you can check the bibliography to find other relevant sources.

To identify the most important publications on your topic, take note of recurring citations. If the same authors, books or articles keep appearing in your reading, make sure to seek them out.

You probably won’t be able to read absolutely everything that has been written on the topic – you’ll have to evaluate which sources are most relevant to your questions.

For each publication, ask yourself:

• What question or problem is the author addressing?
• What are the key concepts and how are they defined?
• What are the key theories, models and methods? Does the research use established frameworks or take an innovative approach?
• What are the results and conclusions of the study?
• How does the publication relate to other literature in the field? Does it confirm, add to, or challenge established knowledge?
• How does the publication contribute to your understanding of the topic? What are its key insights and arguments?
• What are the strengths and weaknesses of the research?

Make sure the sources you use are credible, and make sure you read any landmark studies and major theories in your field of research.

You can find out how many times an article has been cited on Google Scholar – a high citation count means the article has been influential in the field, and should certainly be included in your literature review.

The scope of your review will depend on your topic and discipline: in the sciences you usually only review recent literature, but in the humanities you might take a long historical perspective (for example, to trace how a concept has changed in meaning over time).

Remember that you can use our template to summarise and evaluate sources you’re thinking about using!

Take notes and cite your sources

As you read, you should also begin the writing process. Take notes that you can later incorporate into the text of your literature review.

It’s important to keep track of your sources with references to avoid plagiarism . It can be helpful to make an annotated bibliography, where you compile full reference information and write a paragraph of summary and analysis for each source. This helps you remember what you read and saves time later in the process.

You can use our free APA Reference Generator for quick, correct, consistent citations.

Prevent plagiarism, run a free check.

To begin organising your literature review’s argument and structure, you need to understand the connections and relationships between the sources you’ve read. Based on your reading and notes, you can look for:

• Trends and patterns (in theory, method or results): do certain approaches become more or less popular over time?
• Themes: what questions or concepts recur across the literature?
• Debates, conflicts and contradictions: where do sources disagree?
• Pivotal publications: are there any influential theories or studies that changed the direction of the field?
• Gaps: what is missing from the literature? Are there weaknesses that need to be addressed?

This step will help you work out the structure of your literature review and (if applicable) show how your own research will contribute to existing knowledge.

• Most research has focused on young women.
• There is an increasing interest in the visual aspects of social media.
• But there is still a lack of robust research on highly-visual platforms like Instagram and Snapchat – this is a gap that you could address in your own research.

There are various approaches to organising the body of a literature review. You should have a rough idea of your strategy before you start writing.

Depending on the length of your literature review, you can combine several of these strategies (for example, your overall structure might be thematic, but each theme is discussed chronologically).

Chronological

The simplest approach is to trace the development of the topic over time. However, if you choose this strategy, be careful to avoid simply listing and summarising sources in order.

Try to analyse patterns, turning points and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred.

If you have found some recurring central themes, you can organise your literature review into subsections that address different aspects of the topic.

For example, if you are reviewing literature about inequalities in migrant health outcomes, key themes might include healthcare policy, language barriers, cultural attitudes, legal status, and economic access.

Methodological

If you draw your sources from different disciplines or fields that use a variety of research methods , you might want to compare the results and conclusions that emerge from different approaches. For example:

• Look at what results have emerged in qualitative versus quantitative research
• Discuss how the topic has been approached by empirical versus theoretical scholarship
• Divide the literature into sociological, historical, and cultural sources

Theoretical

A literature review is often the foundation for a theoretical framework . You can use it to discuss various theories, models, and definitions of key concepts.

You might argue for the relevance of a specific theoretical approach, or combine various theoretical concepts to create a framework for your research.

Like any other academic text, your literature review should have an introduction , a main body, and a conclusion . What you include in each depends on the objective of your literature review.

The introduction should clearly establish the focus and purpose of the literature review.

If you are writing the literature review as part of your dissertation or thesis, reiterate your central problem or research question and give a brief summary of the scholarly context. You can emphasise the timeliness of the topic (“many recent studies have focused on the problem of x”) or highlight a gap in the literature (“while there has been much research on x, few researchers have taken y into consideration”).

Depending on the length of your literature review, you might want to divide the body into subsections. You can use a subheading for each theme, time period, or methodological approach.

As you write, make sure to follow these tips:

• Summarise and synthesise: give an overview of the main points of each source and combine them into a coherent whole.
• Analyse and interpret: don’t just paraphrase other researchers – add your own interpretations, discussing the significance of findings in relation to the literature as a whole.
• Critically evaluate: mention the strengths and weaknesses of your sources.
• Write in well-structured paragraphs: use transitions and topic sentences to draw connections, comparisons and contrasts.

In the conclusion, you should summarise the key findings you have taken from the literature and emphasise their significance.

If the literature review is part of your dissertation or thesis, reiterate how your research addresses gaps and contributes new knowledge, or discuss how you have drawn on existing theories and methods to build a framework for your research. This can lead directly into your methodology section.

A literature review is a survey of scholarly sources (such as books, journal articles, and theses) related to a specific topic or research question .

It is often written as part of a dissertation , thesis, research paper , or proposal .

There are several reasons to conduct a literature review at the beginning of a research project:

• To familiarise yourself with the current state of knowledge on your topic
• To ensure that you’re not just repeating what others have already done
• To identify gaps in knowledge and unresolved problems that your research can address
• To develop your theoretical framework and methodology
• To provide an overview of the key findings and debates on the topic

Writing the literature review shows your reader how your work relates to existing research and what new insights it will contribute.

The literature review usually comes near the beginning of your  dissertation . After the introduction , it grounds your research in a scholarly field and leads directly to your theoretical framework or methodology .

Cite this Scribbr article

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McCombes, S. (2022, June 07). What is a Literature Review? | Guide, Template, & Examples. Scribbr. Retrieved 22 April 2024, from https://www.scribbr.co.uk/thesis-dissertation/literature-review/

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• CAREER FEATURE
• 04 December 2020
• Correction 09 December 2020

How to write a superb literature review

Andy Tay is a freelance writer based in Singapore.

You can also search for this author in PubMed   Google Scholar

Literature reviews are important resources for scientists. They provide historical context for a field while offering opinions on its future trajectory. Creating them can provide inspiration for one’s own research, as well as some practice in writing. But few scientists are trained in how to write a review — or in what constitutes an excellent one. Even picking the appropriate software to use can be an involved decision (see ‘Tools and techniques’). So Nature asked editors and working scientists with well-cited reviews for their tips.

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doi: https://doi.org/10.1038/d41586-020-03422-x

Interviews have been edited for length and clarity.

Updates & Corrections

Correction 09 December 2020 : An earlier version of the tables in this article included some incorrect details about the programs Zotero, Endnote and Manubot. These have now been corrected.

Hsing, I.-M., Xu, Y. & Zhao, W. Electroanalysis 19 , 755–768 (2007).

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Literature reviews: criticality.

• Criticality

Express Critical Analysis

The literature review of a dissertation should include critical analysis. You cannot simply juxtapose the literature you find: you have to  evaluate and draw conclusions from it.  

Paragraph level  

Try expressing your voice in each paragraph of your literature review. Write strong paragraphs. In strong paragraphs your voice can be heard in the topic sentence, development (where you analyse and compare/contrast the sources, sometimes as individual pieces, sometimes in a synthesis) and, even more easily, in the concluding sentence, where you present the "therefore" of the paragraph. 

How to express criticality at the paragraph level:  

Identify the significance of the sources, and why the points they are making are relevant  

Make connections between the sources 

Compare and contrast sources, literatures  

Accept/adopt points made by the sources, with reasons  

Reject the points made by the sources, with reasons (e.g., limitations in the methodology; out of date; limited scope; geographical delimitation) 

Indicate the position you are taking in your own work on the theories and concepts presented by the sources 

Show how limitations in the existing literature create a research gap for you 

Organise the materials, synthesising them in an original way, that sheds new light on the topic.  

To find out more about paragraph writing, check out the Assignment Writing Guides.

Literature review level 

Try to take ownership of the literature review. Remember the purposes of the review (providing background on the subject you are researching and identifying a gap in the existing literature on this subject). Thus, throughout the review:   

Identify the key themes relevant to your subject matter  

Identify the most logical and effective order for your themes 

Relate the sources back to the dissertation's research question 

Shed new light on the topic 

Draw conclusions on the existing literature  

Identify gaps in the literature  

Your literature review should present an argument (which you can recap in the concluding paragraph of the literature review). For instance, 

"The literature says/illustrates/reveals that... there are debates in the literature as of... it can be understood from the literature that... however, there are gaps in the literature... the literature does not specifically address (specific sector/location/population)... there is a lack of independent/recent studies on...  therefore in order to answer the research question(s) (you can repeat the question) this dissertation uses method xyz, as illustrated in the next section (if applicable)". 

Manchester University’s  academic phrase bank  is a great resource for learning new words and phrases. 

Extra Resources

For extra help with all aspects of study skills including how to undertake literature reviews, appointments are available with learning advisors on Engage. 

Appointments are also available with an Academic Engagement Librarian to discuss any issues you might be having with research.

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What is a Literature Review? How to Write It (with Examples)

A literature review is a critical analysis and synthesis of existing research on a particular topic. It provides an overview of the current state of knowledge, identifies gaps, and highlights key findings in the literature. 1 The purpose of a literature review is to situate your own research within the context of existing scholarship, demonstrating your understanding of the topic and showing how your work contributes to the ongoing conversation in the field. Learning how to write a literature review is a critical tool for successful research. Your ability to summarize and synthesize prior research pertaining to a certain topic demonstrates your grasp on the topic of study, and assists in the learning process. 

Table of Contents

• What is the purpose of literature review? 
• a. Habitat Loss and Species Extinction: 
• b. Range Shifts and Phenological Changes: 
• c. Ocean Acidification and Coral Reefs: 
• d. Adaptive Strategies and Conservation Efforts: 
• How to write a good literature review 
• Choose a Topic and Define the Research Question: 
• Decide on the Scope of Your Review: 
• Select Databases for Searches: 
• Conduct Searches and Keep Track: 
• Review the Literature: 
• Organize and Write Your Literature Review: 
• Frequently asked questions 

What is a literature review?

A well-conducted literature review demonstrates the researcher’s familiarity with the existing literature, establishes the context for their own research, and contributes to scholarly conversations on the topic. One of the purposes of a literature review is also to help researchers avoid duplicating previous work and ensure that their research is informed by and builds upon the existing body of knowledge.

What is the purpose of literature review?

A literature review serves several important purposes within academic and research contexts. Here are some key objectives and functions of a literature review: 2  

• Contextualizing the Research Problem: The literature review provides a background and context for the research problem under investigation. It helps to situate the study within the existing body of knowledge. 
• Identifying Gaps in Knowledge: By identifying gaps, contradictions, or areas requiring further research, the researcher can shape the research question and justify the significance of the study. This is crucial for ensuring that the new research contributes something novel to the field. 
• Understanding Theoretical and Conceptual Frameworks: Literature reviews help researchers gain an understanding of the theoretical and conceptual frameworks used in previous studies. This aids in the development of a theoretical framework for the current research. 
• Providing Methodological Insights: Another purpose of literature reviews is that it allows researchers to learn about the methodologies employed in previous studies. This can help in choosing appropriate research methods for the current study and avoiding pitfalls that others may have encountered. 
• Establishing Credibility: A well-conducted literature review demonstrates the researcher’s familiarity with existing scholarship, establishing their credibility and expertise in the field. It also helps in building a solid foundation for the new research. 
• Informing Hypotheses or Research Questions: The literature review guides the formulation of hypotheses or research questions by highlighting relevant findings and areas of uncertainty in existing literature. 

Literature review example

Let’s delve deeper with a literature review example: Let’s say your literature review is about the impact of climate change on biodiversity. You might format your literature review into sections such as the effects of climate change on habitat loss and species extinction, phenological changes, and marine biodiversity. Each section would then summarize and analyze relevant studies in those areas, highlighting key findings and identifying gaps in the research. The review would conclude by emphasizing the need for further research on specific aspects of the relationship between climate change and biodiversity. The following literature review template provides a glimpse into the recommended literature review structure and content, demonstrating how research findings are organized around specific themes within a broader topic. 

Literature Review on Climate Change Impacts on Biodiversity:

Climate change is a global phenomenon with far-reaching consequences, including significant impacts on biodiversity. This literature review synthesizes key findings from various studies: 

a. Habitat Loss and Species Extinction:

Climate change-induced alterations in temperature and precipitation patterns contribute to habitat loss, affecting numerous species (Thomas et al., 2004). The review discusses how these changes increase the risk of extinction, particularly for species with specific habitat requirements. 

b. Range Shifts and Phenological Changes:

Observations of range shifts and changes in the timing of biological events (phenology) are documented in response to changing climatic conditions (Parmesan & Yohe, 2003). These shifts affect ecosystems and may lead to mismatches between species and their resources. 

c. Ocean Acidification and Coral Reefs:

The review explores the impact of climate change on marine biodiversity, emphasizing ocean acidification’s threat to coral reefs (Hoegh-Guldberg et al., 2007). Changes in pH levels negatively affect coral calcification, disrupting the delicate balance of marine ecosystems. 

d. Adaptive Strategies and Conservation Efforts:

Recognizing the urgency of the situation, the literature review discusses various adaptive strategies adopted by species and conservation efforts aimed at mitigating the impacts of climate change on biodiversity (Hannah et al., 2007). It emphasizes the importance of interdisciplinary approaches for effective conservation planning. 

How to write a good literature review

Writing a literature review involves summarizing and synthesizing existing research on a particular topic. A good literature review format should include the following elements. 

Introduction: The introduction sets the stage for your literature review, providing context and introducing the main focus of your review. 

• Opening Statement: Begin with a general statement about the broader topic and its significance in the field. 
• Scope and Purpose: Clearly define the scope of your literature review. Explain the specific research question or objective you aim to address. 
• Organizational Framework: Briefly outline the structure of your literature review, indicating how you will categorize and discuss the existing research. 
• Significance of the Study: Highlight why your literature review is important and how it contributes to the understanding of the chosen topic. 
• Thesis Statement: Conclude the introduction with a concise thesis statement that outlines the main argument or perspective you will develop in the body of the literature review. 

Body: The body of the literature review is where you provide a comprehensive analysis of existing literature, grouping studies based on themes, methodologies, or other relevant criteria. 

• Organize by Theme or Concept: Group studies that share common themes, concepts, or methodologies. Discuss each theme or concept in detail, summarizing key findings and identifying gaps or areas of disagreement. 
• Critical Analysis: Evaluate the strengths and weaknesses of each study. Discuss the methodologies used, the quality of evidence, and the overall contribution of each work to the understanding of the topic. 
• Synthesis of Findings: Synthesize the information from different studies to highlight trends, patterns, or areas of consensus in the literature. 
• Identification of Gaps: Discuss any gaps or limitations in the existing research and explain how your review contributes to filling these gaps. 
• Transition between Sections: Provide smooth transitions between different themes or concepts to maintain the flow of your literature review. 

Conclusion: The conclusion of your literature review should summarize the main findings, highlight the contributions of the review, and suggest avenues for future research. 

• Summary of Key Findings: Recap the main findings from the literature and restate how they contribute to your research question or objective. 
• Contributions to the Field: Discuss the overall contribution of your literature review to the existing knowledge in the field. 
• Implications and Applications: Explore the practical implications of the findings and suggest how they might impact future research or practice. 
• Recommendations for Future Research: Identify areas that require further investigation and propose potential directions for future research in the field. 
• Final Thoughts: Conclude with a final reflection on the importance of your literature review and its relevance to the broader academic community. 

Conducting a literature review

Conducting a literature review is an essential step in research that involves reviewing and analyzing existing literature on a specific topic. It’s important to know how to do a literature review effectively, so here are the steps to follow: 1  

Choose a Topic and Define the Research Question:

• Select a topic that is relevant to your field of study. 
• Clearly define your research question or objective. Determine what specific aspect of the topic do you want to explore? 

Decide on the Scope of Your Review:

• Determine the timeframe for your literature review. Are you focusing on recent developments, or do you want a historical overview? 
• Consider the geographical scope. Is your review global, or are you focusing on a specific region? 
• Define the inclusion and exclusion criteria. What types of sources will you include? Are there specific types of studies or publications you will exclude? 

Select Databases for Searches:

• Identify relevant databases for your field. Examples include PubMed, IEEE Xplore, Scopus, Web of Science, and Google Scholar. 
• Consider searching in library catalogs, institutional repositories, and specialized databases related to your topic. 

Conduct Searches and Keep Track:

• Develop a systematic search strategy using keywords, Boolean operators (AND, OR, NOT), and other search techniques. 
• Record and document your search strategy for transparency and replicability. 
• Keep track of the articles, including publication details, abstracts, and links. Use citation management tools like EndNote, Zotero, or Mendeley to organize your references. 

Review the Literature:

• Evaluate the relevance and quality of each source. Consider the methodology, sample size, and results of studies. 
• Organize the literature by themes or key concepts. Identify patterns, trends, and gaps in the existing research. 
• Summarize key findings and arguments from each source. Compare and contrast different perspectives. 
• Identify areas where there is a consensus in the literature and where there are conflicting opinions. 
• Provide critical analysis and synthesis of the literature. What are the strengths and weaknesses of existing research? 

Organize and Write Your Literature Review:

• Literature review outline should be based on themes, chronological order, or methodological approaches. 
• Write a clear and coherent narrative that synthesizes the information gathered. 
• Use proper citations for each source and ensure consistency in your citation style (APA, MLA, Chicago, etc.). 
• Conclude your literature review by summarizing key findings, identifying gaps, and suggesting areas for future research. 

The literature review sample and detailed advice on writing and conducting a review will help you produce a well-structured report. But remember that a literature review is an ongoing process, and it may be necessary to revisit and update it as your research progresses. 

Frequently asked questions

A literature review is a critical and comprehensive analysis of existing literature (published and unpublished works) on a specific topic or research question and provides a synthesis of the current state of knowledge in a particular field. A well-conducted literature review is crucial for researchers to build upon existing knowledge, avoid duplication of efforts, and contribute to the advancement of their field. It also helps researchers situate their work within a broader context and facilitates the development of a sound theoretical and conceptual framework for their studies.

Literature review is a crucial component of research writing, providing a solid background for a research paper’s investigation. The aim is to keep professionals up to date by providing an understanding of ongoing developments within a specific field, including research methods, and experimental techniques used in that field, and present that knowledge in the form of a written report. Also, the depth and breadth of the literature review emphasizes the credibility of the scholar in his or her field.  

Before writing a literature review, it’s essential to undertake several preparatory steps to ensure that your review is well-researched, organized, and focused. This includes choosing a topic of general interest to you and doing exploratory research on that topic, writing an annotated bibliography, and noting major points, especially those that relate to the position you have taken on the topic. 

Literature reviews and academic research papers are essential components of scholarly work but serve different purposes within the academic realm. 3 A literature review aims to provide a foundation for understanding the current state of research on a particular topic, identify gaps or controversies, and lay the groundwork for future research. Therefore, it draws heavily from existing academic sources, including books, journal articles, and other scholarly publications. In contrast, an academic research paper aims to present new knowledge, contribute to the academic discourse, and advance the understanding of a specific research question. Therefore, it involves a mix of existing literature (in the introduction and literature review sections) and original data or findings obtained through research methods. 

Literature reviews are essential components of academic and research papers, and various strategies can be employed to conduct them effectively. If you want to know how to write a literature review for a research paper, here are four common approaches that are often used by researchers.  Chronological Review: This strategy involves organizing the literature based on the chronological order of publication. It helps to trace the development of a topic over time, showing how ideas, theories, and research have evolved.  Thematic Review: Thematic reviews focus on identifying and analyzing themes or topics that cut across different studies. Instead of organizing the literature chronologically, it is grouped by key themes or concepts, allowing for a comprehensive exploration of various aspects of the topic.  Methodological Review: This strategy involves organizing the literature based on the research methods employed in different studies. It helps to highlight the strengths and weaknesses of various methodologies and allows the reader to evaluate the reliability and validity of the research findings.  Theoretical Review: A theoretical review examines the literature based on the theoretical frameworks used in different studies. This approach helps to identify the key theories that have been applied to the topic and assess their contributions to the understanding of the subject.  It’s important to note that these strategies are not mutually exclusive, and a literature review may combine elements of more than one approach. The choice of strategy depends on the research question, the nature of the literature available, and the goals of the review. Additionally, other strategies, such as integrative reviews or systematic reviews, may be employed depending on the specific requirements of the research.

The literature review format can vary depending on the specific publication guidelines. However, there are some common elements and structures that are often followed. Here is a general guideline for the format of a literature review:  Introduction:   Provide an overview of the topic.  Define the scope and purpose of the literature review.  State the research question or objective.  Body:   Organize the literature by themes, concepts, or chronology.  Critically analyze and evaluate each source.  Discuss the strengths and weaknesses of the studies.  Highlight any methodological limitations or biases.  Identify patterns, connections, or contradictions in the existing research.  Conclusion:   Summarize the key points discussed in the literature review.  Highlight the research gap.  Address the research question or objective stated in the introduction.  Highlight the contributions of the review and suggest directions for future research.

Both annotated bibliographies and literature reviews involve the examination of scholarly sources. While annotated bibliographies focus on individual sources with brief annotations, literature reviews provide a more in-depth, integrated, and comprehensive analysis of existing literature on a specific topic. The key differences are as follows: 

References 

• Denney, A. S., & Tewksbury, R. (2013). How to write a literature review.  Journal of criminal justice education ,  24 (2), 218-234. 
• Pan, M. L. (2016).  Preparing literature reviews: Qualitative and quantitative approaches . Taylor & Francis. 
• Cantero, C. (2019). How to write a literature review.  San José State University Writing Center . 

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Academic Phrasebank

Referring to sources.

• GENERAL LANGUAGE FUNCTIONS
• Being cautious
• Being critical
• Classifying and listing
• Compare and contrast
• Defining terms
• Describing trends
• Describing quantities
• Explaining causality
• Giving examples
• Signalling transition
• Writing about the past

One of the distinguishing features of academic writing is that it is informed by what is already known, what work has been done before, and/or what ideas and models have already been developed. Thus, in academic texts, writers frequently make reference to other studies and to the work of other authors. It is important that writers guide their readers through this literature. This section of  Academic Phrasebank  lists some of the phrases that writers may use for this purpose.

A note on the literature review: It is the purpose of the literature review section of a paper or dissertation to show the reader, in a systematic way, what is already known about the research topic as a whole, and to outline the key ideas and theories that help us to understand this. As well as being systematic, the review should be evaluative and critical of the studies or ideas which are relevant to the current work. For example, you may think a particular study did not investigate some important aspect of the area you are researching, that the author(s) failed to notice a weakness in their methods, or that their conclusion is not well-supported (refer to  Being Critical ).

A note on referencing style: The way a writer refers to other sources varies somewhat across different disciplines. In some cases, where the individual author is important, the author’s name will be the main subject of the sentence; in other cases, the author’s name may only be mentioned in brackets ( … ) or via a number notation system (e.g. footnotes and endnotes). The ‘author as subject’ style is less common in the empirical disciplines (sciences) and more commonly used in the humanities. Different referencing systems are used in different disciplines. In the majority of the examples given here, the Harvard in-text referencing system has been used.

A note on verb tenses: For general reference to the literature, the present perfect tense (have/has + verb participle) tends to be used. For reference to specific studies carried out in the past, the simple past tense is most commonly used. This is normally the case where a specific date or point in time in the past forms a part of the sentence. When referring to the words or ideas of writers, the present tense is often used if the ideas are still relevant, even if the author is no longer alive. The examples given below reflect these general patterns, but these are by no means rigid.

General comments on the relevant literature

The literature on X has highlighted several … Different theories exist in the literature regarding … More recent attention has focused on the provision of … There are relatively few historical studies in the area of … A large and growing body of literature has investigated … Much of the literature since the mid-1990s emphasises the … Much of the current literature on X pays particular attention to … There is a large volume of published studies describing the role of … The existing literature on X is extensive and focuses particularly on … There is a relatively small body of literature that is concerned with … The generalisability of much published research on this issue is problematic. A considerable amount of literature has been published on X. These studies … The academic literature on X has revealed the emergence of several contrasting themes. Previous research findings into X have been inconsistent and contradictory (Smith, 1996; …).

Previous research: a historical perspective

Research into X has a long history. For many years, this phenomenon was surprisingly neglected by … Only in the past ten years have studies of X directly addressed how … Prior to the work of Smith (1983), the role of X was largely unknown. Over the past decade, most research in X has emphasized the use of … In recent years, there has been an increasing amount of literature on … Early examples of research into X include … (Smith, 1962; Jones, 1974). During the past 30 years, much more information has become available on … The first serious discussions and analyses of X emerged during the 1970s with … Over the past two decades, major advances in molecular biology have allowed … Historically, research investigating the factors associated with X has focused on … It is only since the work of Smith (2001) that the study of X has gained momentum. The construct of X was first articulated by Smith (1977) and popularised in his book: … Around the early 1960s, small-scale research and case studies began to emerge linking … It was not until the late 1960s that historians considered X worthy of scholarly attention. Awareness of X is not recent, having possibly first been described in the 5th century BCE by …

Previous research: methodological approaches taken

Most research on X has been carried out in … Most researchers investigating X have utilised … Using this approach, researchers have been able to … Several systematic reviews of X have been undertaken. The vast majority of studies on X have been quantitative. What we know about X is largely based on observational studies. There are a number of large cross-sectional studies which suggest … Much of the previous research on X has been exploratory in nature. Much of the X research has focused on identifying and evaluating the … What we know about X is largely based upon empirical studies that investigate … Publications that concentrate on X more frequently adopt a historical or chronological approach …

Previous research: area investigated

To date, several studies have investigated … A number of studies have begun to examine … Various studies have assessed the efficacy of … Researchers attempted to evaluate the impact of … A great deal of previous research into X has focused on … Several studies have used longitudinal data to examine … Previous studies have explored the relationships between X and Y. Twenty cohort study analyses have examined the relationship between … A number of authors have considered the effects of … (Smith, 2003; Jones, 2004). At least 120 case-control studies worldwide have examined the relationship between … Numerous studies have attempted to explain … (for example, Smith, 1996; Jones, 1998; …).

Previous research: what has been established or proposed

Several lines of evidence suggest that … Previous research has established that … Data from several studies suggest that … Recent evidence suggests that … (Smith, 2020; …). It is now well established from a variety of studies that … New findings amongst X provides further evidence that …

A number of studies have postulated a convergence between … Recently, considerable evidence has accumulated to show that … Surveys such as that conducted by Smith (2015) have shown that … Many recent studies (e.g. Smith, 2019; Jones, 2020) have shown that … Traditionally, it has been argued that … (e.g. Smith, 1960; Jones, 1972). Several biographies of Brown have been published. Smith (2016) presents …

In previous studies on X, different variables have been found to be related to … Many historians have argued that … (e.g. Jones, 1997; Brown, 1999; Smith, 2019). There is a consensus among social scientists that … (e.g. Smith, 2019; Jones, 2020; … Data from several sources have identified the increased X and Y associated with obesity. Recently, in vitro studies have shown that X can … (Smith et al. , 2018; Jones et al. , 2021). It has been demonstrated that a high intake of X results in damage to … (Smith, 2015; …).

Stating what is currently known about the topic

X increases when … (Smith, 2015) X is able to affect Y (Smith, 2015; Jones, 2020). X is positively related to Y (Smith, 2015; Jones, 2020). X is proportional to Y as expressed by the… (Smith, 2015). X is one of the most important … (Smith, 2015; Jones, 2020). X is one of the most intense reactions following Y (Jones, 2020). A relationship exists between X and Y (Smith, 2015; Jones, 2020). X is a principal determining factor of Y (Smith, 2015; Jones, 2020). There is an unambiguous relationship between X and Y (Smith, 2015). X is significantly reduced during the first months of … (Smith, 2015; Jones, 2020). X has been found to oppose the anti-inflammatory actions of Y on Z (Smith, 2020).

Reference to a previous investigation: researcher prominent

Smith’s comparative study (2017) found that … Jones’s comprehensive review concluded that … Brown’s (1998) model of X assumes three main … Smith’s cross-country analysis (2017) showed that … Jones’s (2010) review of the literature concluded that … Brown’s (2022) recent analysis of X provides a strong critique of …

Reference to a previous investigation: time prominent

In 1959, a seminal article was published entitled … Following this period, Smith actively searched for X. In the 1950s, Smith pointed to some of the ways in which … Thirty years later, Smith (1974) reported three cases of X which … Almost 20 years ago, Jones (1995) formulated his X theory, centred around …

Reference to a previous investigation: investigation prominent

One longitudinal study found that … A seminal study in this area is the work of … One study by Smith (2014) examined the trend in … A recent study by Smith and Jones (2012) involved … A qualitative study by Smith (2003) described how … A recent systematic literature review concluded that … Preliminary work on X was undertaken by Jones (1992). A longitudinal study of X by Smith (2012) reports that … A key study comparing X and Y is that of Smith (2010), in which … The first systematic study of X was reported by Smith  et al.  in 1986. Detailed examination of X by Smith and Jones (1961) showed that … Analysis of the genes involved in X was first carried out by Smith  et al.  (1983). A significant analysis and discussion on the subject was presented by Smith (1988). The study of the structural behaviour of X was first carried out by Jones  et al.  (1986). A small scale study by Smith (2015) reached different conclusions, finding no increase in … The study by Jones (1990) offers probably the most comprehensive empirical analysis of …

Reference to a previous investigation: topic prominent

To determine the effects of X, Jones  et al . (2005) compared … X was originally isolated from Y in a soil sample from … (Jones  et al. , 1952). The electronic spectroscopy of X was first studied by Smith and Jones in 1970. X formed the central focus of a study by Smith (2002) in which the author found … To better understand the mechanisms of X and its effects, Jones (2013) analysed the … X was first demonstrated experimentally by Pavlov (Smith, 2002). In his seminal study … The acid-catalyzed condensation reaction between X and Y was first reported by Smith in 1872. The way in which X is regulated was studied extensively by Smith and colleagues (Smith  et al.  1995 and 1998).

Reference to what other writers do in their published work

In Chapter 2, Smith provides us with a number of important … In the subsequent chapter, Smith examines the extent to which … By drawing on the concept of X, Smith has been able to show that … Some analysts (e.g. Smith, 2015) have attempted to draw fine distinctions between … Drawing on an extensive range of sources, the authors set out the different ways in which … Other authors (see Smith, 2010; Jones, 2014) question the usefulness of such an approach.  

Reference to another writer's idea or position

As noted by Smith (2003) X is far more cost effective, and therefore … According to Smith (2003), preventative medicine is far more cost effective, and therefore … 

Synthesising material: supporting evidence or ideas

Similarly, Jones (2015) found that X … This is consistent with the data obtained by … Smith (1995) makes a similar point in his study of X … In the same vein, Smith (1995) in his book XYZ notes This view is supported by Jones (2015) who writes that Along the same lines, Smith (1995) subsequently argued that … Smith argues that her data support Jones’s (1995) view that Jones’s (1986) work on X is complemented by Smith’s (2009) study of Almost every paper that has been written on X includes a section relating to A broadly similar point has also recently been made by Johnson (2019), who …

Synthesising material: contrasting evidence or ideas

Other writers have argued that … Other studies have concluded that … Unlike Smith, Jones (2013) argues that In contrast to Smith, Jones (2013) argues that Smith (2010) presents an X account, whilst Jones (2011) While Smith (2008) focuses on X, Jones (2009) is more concerned with A broader perspective has been adopted by Smith (213) who argues that Contrary to previously published studies, Jones et al. demonstrated the efficacy of… This result conflicts with Smith’s (1965) previously mentioned study which found that … Conversely, Smith (2010) reported no significant difference in mortality between X and Y.

Some ways of introducing quotations

Commenting on X, Smith (2003) argues: ‘… …’ As Smith (2004: 215) states: ‘there are many good reasons to be sceptical’. As Smith argues: ‘In the past, the purpose of education was to …’ (Smith, 2000:150). In the final part of the  Theses on Feuerbach , Marx writes: ‘Philosophers have hitherto only …’ Smith concludes: ‘The idea of development stands today like a ruin in …’ (Smith, 1992: 156).

Summarising the review or parts of the review

Together, these studies indicate that … Overall, these studies highlight the need for … Considering all of this evidence, it seems that … Collectively, these studies outline a critical role for… In all the studies reviewed here, X is recognised as … The evidence presented in this section suggests that … The studies presented thus far provide evidence that … Taken together, these studies support the notion that … Overall, there seems to be some evidence to indicate that … Together these studies provide important insights into the … All of the studies reviewed here support the hypothesis that … Two important themes emerge from the studies discussed so far: However, such studies remain narrow in focus dealing only with … The evidence reviewed here seems to suggest a pertinent role for … These studies clearly indicate that there is a relationship between … In view of all that has been mentioned so far, one may suppose that … There remain several aspects of X about which relatively little is known.

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Writing a Literature Review

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A literature review is a document or section of a document that collects key sources on a topic and discusses those sources in conversation with each other (also called synthesis ). The lit review is an important genre in many disciplines, not just literature (i.e., the study of works of literature such as novels and plays). When we say “literature review” or refer to “the literature,” we are talking about the research ( scholarship ) in a given field. You will often see the terms “the research,” “the scholarship,” and “the literature” used mostly interchangeably.

Where, when, and why would I write a lit review?

There are a number of different situations where you might write a literature review, each with slightly different expectations; different disciplines, too, have field-specific expectations for what a literature review is and does. For instance, in the humanities, authors might include more overt argumentation and interpretation of source material in their literature reviews, whereas in the sciences, authors are more likely to report study designs and results in their literature reviews; these differences reflect these disciplines’ purposes and conventions in scholarship. You should always look at examples from your own discipline and talk to professors or mentors in your field to be sure you understand your discipline’s conventions, for literature reviews as well as for any other genre.

A literature review can be a part of a research paper or scholarly article, usually falling after the introduction and before the research methods sections. In these cases, the lit review just needs to cover scholarship that is important to the issue you are writing about; sometimes it will also cover key sources that informed your research methodology.

Lit reviews can also be standalone pieces, either as assignments in a class or as publications. In a class, a lit review may be assigned to help students familiarize themselves with a topic and with scholarship in their field, get an idea of the other researchers working on the topic they’re interested in, find gaps in existing research in order to propose new projects, and/or develop a theoretical framework and methodology for later research. As a publication, a lit review usually is meant to help make other scholars’ lives easier by collecting and summarizing, synthesizing, and analyzing existing research on a topic. This can be especially helpful for students or scholars getting into a new research area, or for directing an entire community of scholars toward questions that have not yet been answered.

What are the parts of a lit review?

Most lit reviews use a basic introduction-body-conclusion structure; if your lit review is part of a larger paper, the introduction and conclusion pieces may be just a few sentences while you focus most of your attention on the body. If your lit review is a standalone piece, the introduction and conclusion take up more space and give you a place to discuss your goals, research methods, and conclusions separately from where you discuss the literature itself.

Introduction:

• An introductory paragraph that explains what your working topic and thesis is
• A forecast of key topics or texts that will appear in the review
• Potentially, a description of how you found sources and how you analyzed them for inclusion and discussion in the review (more often found in published, standalone literature reviews than in lit review sections in an article or research paper)
• Summarize and synthesize: Give an overview of the main points of each source and combine them into a coherent whole
• Analyze and interpret: Don’t just paraphrase other researchers – add your own interpretations where possible, discussing the significance of findings in relation to the literature as a whole
• Critically Evaluate: Mention the strengths and weaknesses of your sources
• Write in well-structured paragraphs: Use transition words and topic sentence to draw connections, comparisons, and contrasts.

Conclusion:

• Summarize the key findings you have taken from the literature and emphasize their significance
• Connect it back to your primary research question

How should I organize my lit review?

Lit reviews can take many different organizational patterns depending on what you are trying to accomplish with the review. Here are some examples:

• Chronological : The simplest approach is to trace the development of the topic over time, which helps familiarize the audience with the topic (for instance if you are introducing something that is not commonly known in your field). If you choose this strategy, be careful to avoid simply listing and summarizing sources in order. Try to analyze the patterns, turning points, and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred (as mentioned previously, this may not be appropriate in your discipline — check with a teacher or mentor if you’re unsure).
• Thematic : If you have found some recurring central themes that you will continue working with throughout your piece, you can organize your literature review into subsections that address different aspects of the topic. For example, if you are reviewing literature about women and religion, key themes can include the role of women in churches and the religious attitude towards women.
• Qualitative versus quantitative research
• Empirical versus theoretical scholarship
• Divide the research by sociological, historical, or cultural sources
• Theoretical : In many humanities articles, the literature review is the foundation for the theoretical framework. You can use it to discuss various theories, models, and definitions of key concepts. You can argue for the relevance of a specific theoretical approach or combine various theorical concepts to create a framework for your research.

What are some strategies or tips I can use while writing my lit review?

Any lit review is only as good as the research it discusses; make sure your sources are well-chosen and your research is thorough. Don’t be afraid to do more research if you discover a new thread as you’re writing. More info on the research process is available in our "Conducting Research" resources .

As you’re doing your research, create an annotated bibliography ( see our page on the this type of document ). Much of the information used in an annotated bibliography can be used also in a literature review, so you’ll be not only partially drafting your lit review as you research, but also developing your sense of the larger conversation going on among scholars, professionals, and any other stakeholders in your topic.

Usually you will need to synthesize research rather than just summarizing it. This means drawing connections between sources to create a picture of the scholarly conversation on a topic over time. Many student writers struggle to synthesize because they feel they don’t have anything to add to the scholars they are citing; here are some strategies to help you:

• It often helps to remember that the point of these kinds of syntheses is to show your readers how you understand your research, to help them read the rest of your paper.
• Writing teachers often say synthesis is like hosting a dinner party: imagine all your sources are together in a room, discussing your topic. What are they saying to each other?
• Look at the in-text citations in each paragraph. Are you citing just one source for each paragraph? This usually indicates summary only. When you have multiple sources cited in a paragraph, you are more likely to be synthesizing them (not always, but often
• Read more about synthesis here.

The most interesting literature reviews are often written as arguments (again, as mentioned at the beginning of the page, this is discipline-specific and doesn’t work for all situations). Often, the literature review is where you can establish your research as filling a particular gap or as relevant in a particular way. You have some chance to do this in your introduction in an article, but the literature review section gives a more extended opportunity to establish the conversation in the way you would like your readers to see it. You can choose the intellectual lineage you would like to be part of and whose definitions matter most to your thinking (mostly humanities-specific, but this goes for sciences as well). In addressing these points, you argue for your place in the conversation, which tends to make the lit review more compelling than a simple reporting of other sources.

• Directories

Language of the literature review

The language that you use in a literature review is important for informing readers where you stand on relevant debates on your topic or issue. In a writer-responsible academic culture, it is your job to lead readers to the meanings and conclusions that you want them to make. Since literature reviews can involve complex ideas and various bodies of literature, it is necessary to be explicit about how the the studies that you cite are connected to each other and are relevant for your own research, and how the ideas introduced are relevant for developing your argument. You can achieve this by using language that clearly indicates your position and strengthens your voice in relation to others'.

In your introduction, you should make it clear what the purpose of the literature review is, as in the following.

Note how the author explains the purpose of the literature review ("The aim of the chapter is to define the kinds of intervention that will have the most beneficial impact"). The author also generally identifies the literature review's key message ("Answers to these questions are found in accounts of both cause and action"). In your own introduction, you could go into more detail about your argument. For example, consider the introduction below, which explains the key points more directly.

To see how other people in your field write literature reviews in a thesis, check out the ANU Digital Thesis Collection to find other theses, and ask your supervisor to show you some past samples.

Within paragraphs, your choice of language can help you to explain connections between the literature's concepts. Take a look at the words in bold in the sample text below, and note how they help the author to guide you through the ideas.

Critically evaluating the literature

A key role of your literature review is to show your critical interpretation and evaluation of the literature. When taking notes and researching, you can develop this critical evaluation by asking yourself questions such as:

• what are the strengths and weaknesses/limitations of the different bodies of literature/studies you are reviewing?
• what accounts for authors' different findings-how can these be explained (e.g. theory or methodology adopted etc.)? (Hold your sources in relation)
• to which issues, gaps, ambiguities, unresolved problems, etc. in the literature do you wish to particularly draw attention and why?
• what are the implications of your discussions? (Don't leave your reader thinking: "This is an interesting piece of critical analysis, but what's the point of it all?" "So what?")

When it comes to writing up your literature review, you can use language to show your critical interpretation and evaluation. For example, take a look at the words in bold in the sample text below. How do they show interpretation and evaluation?

Positioning your research in relation to the literature

It could be that you are expected to reserve detailed discussion of your own research for a distinct section within or following your literature review. More likely though, you will be expected to situate your own research in relation to the literature during the review. The examples below shows how the authors relate their own research to the literature they review. Note how they tell you what they are doing, why they are doing it, where they are going, and where you can find more detailed information within other areas of the thesis.

Literature reviews

Purpose of traditional literature reviews

Placement of traditional literature reviews

Structuring a literature review

Systematic literature reviews

Grounded theory literature reviews

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How to Write Critical Reviews

When you are asked to write a critical review of a book or article, you will need to identify, summarize, and evaluate the ideas and information the author has presented. In other words, you will be examining another person’s thoughts on a topic from your point of view.

Your stand must go beyond your “gut reaction” to the work and be based on your knowledge (readings, lecture, experience) of the topic as well as on factors such as criteria stated in your assignment or discussed by you and your instructor.

Make your stand clear at the beginning of your review, in your evaluations of specific parts, and in your concluding commentary.

Remember that your goal should be to make a few key points about the book or article, not to discuss everything the author writes.

Understanding the Assignment

To write a good critical review, you will have to engage in the mental processes of analyzing (taking apart) the work–deciding what its major components are and determining how these parts (i.e., paragraphs, sections, or chapters) contribute to the work as a whole.

Analyzing the work will help you focus on how and why the author makes certain points and prevent you from merely summarizing what the author says. Assuming the role of an analytical reader will also help you to determine whether or not the author fulfills the stated purpose of the book or article and enhances your understanding or knowledge of a particular topic.

Be sure to read your assignment thoroughly before you read the article or book. Your instructor may have included specific guidelines for you to follow. Keeping these guidelines in mind as you read the article or book can really help you write your paper!

Also, note where the work connects with what you’ve studied in the course. You can make the most efficient use of your reading and notetaking time if you are an active reader; that is, keep relevant questions in mind and jot down page numbers as well as your responses to ideas that appear to be significant as you read.

Please note: The length of your introduction and overview, the number of points you choose to review, and the length of your conclusion should be proportionate to the page limit stated in your assignment and should reflect the complexity of the material being reviewed as well as the expectations of your reader.

Write the introduction

Below are a few guidelines to help you write the introduction to your critical review.

Introduce your review appropriately

Begin your review with an introduction appropriate to your assignment.

If your assignment asks you to review only one book and not to use outside sources, your introduction will focus on identifying the author, the title, the main topic or issue presented in the book, and the author’s purpose in writing the book.

If your assignment asks you to review the book as it relates to issues or themes discussed in the course, or to review two or more books on the same topic, your introduction must also encompass those expectations.

Explain relationships

For example, before you can review two books on a topic, you must explain to your reader in your introduction how they are related to one another.

Within this shared context (or under this “umbrella”) you can then review comparable aspects of both books, pointing out where the authors agree and differ.

In other words, the more complicated your assignment is, the more your introduction must accomplish.

Finally, the introduction to a book review is always the place for you to establish your position as the reviewer (your thesis about the author’s thesis).

As you write, consider the following questions:

• Is the book a memoir, a treatise, a collection of facts, an extended argument, etc.? Is the article a documentary, a write-up of primary research, a position paper, etc.?
• Who is the author? What does the preface or foreword tell you about the author’s purpose, background, and credentials? What is the author’s approach to the topic (as a journalist? a historian? a researcher?)?
• What is the main topic or problem addressed? How does the work relate to a discipline, to a profession, to a particular audience, or to other works on the topic?
• What is your critical evaluation of the work (your thesis)? Why have you taken that position? What criteria are you basing your position on?

Provide an overview

In your introduction, you will also want to provide an overview. An overview supplies your reader with certain general information not appropriate for including in the introduction but necessary to understanding the body of the review.

Generally, an overview describes your book’s division into chapters, sections, or points of discussion. An overview may also include background information about the topic, about your stand, or about the criteria you will use for evaluation.

The overview and the introduction work together to provide a comprehensive beginning for (a “springboard” into) your review.

• What are the author’s basic premises? What issues are raised, or what themes emerge? What situation (i.e., racism on college campuses) provides a basis for the author’s assertions?
• How informed is my reader? What background information is relevant to the entire book and should be placed here rather than in a body paragraph?

Write the body

The body is the center of your paper, where you draw out your main arguments. Below are some guidelines to help you write it.

Organize using a logical plan

Organize the body of your review according to a logical plan. Here are two options:

• First, summarize, in a series of paragraphs, those major points from the book that you plan to discuss; incorporating each major point into a topic sentence for a paragraph is an effective organizational strategy. Second, discuss and evaluate these points in a following group of paragraphs. (There are two dangers lurking in this pattern–you may allot too many paragraphs to summary and too few to evaluation, or you may re-summarize too many points from the book in your evaluation section.)
• Alternatively, you can summarize and evaluate the major points you have chosen from the book in a point-by-point schema. That means you will discuss and evaluate point one within the same paragraph (or in several if the point is significant and warrants extended discussion) before you summarize and evaluate point two, point three, etc., moving in a logical sequence from point to point to point. Here again, it is effective to use the topic sentence of each paragraph to identify the point from the book that you plan to summarize or evaluate.

Questions to keep in mind as you write

With either organizational pattern, consider the following questions:

• What are the author’s most important points? How do these relate to one another? (Make relationships clear by using transitions: “In contrast,” an equally strong argument,” “moreover,” “a final conclusion,” etc.).
• What types of evidence or information does the author present to support his or her points? Is this evidence convincing, controversial, factual, one-sided, etc.? (Consider the use of primary historical material, case studies, narratives, recent scientific findings, statistics.)
• Where does the author do a good job of conveying factual material as well as personal perspective? Where does the author fail to do so? If solutions to a problem are offered, are they believable, misguided, or promising?
• Which parts of the work (particular arguments, descriptions, chapters, etc.) are most effective and which parts are least effective? Why?
• Where (if at all) does the author convey personal prejudice, support illogical relationships, or present evidence out of its appropriate context?

Keep your opinions distinct and cite your sources

Remember, as you discuss the author’s major points, be sure to distinguish consistently between the author’s opinions and your own.

Keep the summary portions of your discussion concise, remembering that your task as a reviewer is to re-see the author’s work, not to re-tell it.

And, importantly, if you refer to ideas from other books and articles or from lecture and course materials, always document your sources, or else you might wander into the realm of plagiarism.

Include only that material which has relevance for your review and use direct quotations sparingly. The Writing Center has other handouts to help you paraphrase text and introduce quotations.

Write the conclusion

You will want to use the conclusion to state your overall critical evaluation.

You have already discussed the major points the author makes, examined how the author supports arguments, and evaluated the quality or effectiveness of specific aspects of the book or article.

Now you must make an evaluation of the work as a whole, determining such things as whether or not the author achieves the stated or implied purpose and if the work makes a significant contribution to an existing body of knowledge.

Consider the following questions:

• Is the work appropriately subjective or objective according to the author’s purpose?
• How well does the work maintain its stated or implied focus? Does the author present extraneous material? Does the author exclude or ignore relevant information?
• How well has the author achieved the overall purpose of the book or article? What contribution does the work make to an existing body of knowledge or to a specific group of readers? Can you justify the use of this work in a particular course?
• What is the most important final comment you wish to make about the book or article? Do you have any suggestions for the direction of future research in the area? What has reading this work done for you or demonstrated to you?

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• Writing a Critical Review

Writing a Critique

A critique (or critical review) is not to be mistaken for a literature review. A 'critical review', or 'critique', is a complete type of text (or genre), discussing one particular article or book in detail.  In some instances, you may be asked to write a critique of two or three articles (e.g. a comparative critical review). In contrast, a 'literature review', which also needs to be 'critical', is a part of a larger type of text, such as a chapter of your dissertation.

Most importantly: Read your article / book as many times as possible, as this will make the critical review much easier.

1. Read and take notes 2. Organising your writing 3. Summary 4. Evaluation 5. Linguistic features of a critical review 6. Summary language 7. Evaluation language 8. Conclusion language 9. Example extracts from a critical review 10. Further resources

Read and Take Notes

To improve your reading confidence and efficiency, visit our pages on reading.

Further reading: Read Confidently

After you are familiar with the text, make notes on some of the following questions. Choose the questions which seem suitable:

• What kind of article is it (for example does it present data or does it present purely theoretical arguments)?
• What is the main area under discussion?
• What are the main findings?
• What are the stated limitations?
• Where does the author's data and evidence come from? Are they appropriate / sufficient?
• What are the main issues raised by the author?
• What questions are raised?
• How well are these questions addressed?
• What are the major points/interpretations made by the author in terms of the issues raised?
• Is the text balanced? Is it fair / biased?
• Does the author contradict herself?
• How does all this relate to other literature on this topic?
• How does all this relate to your own experience, ideas and views?
• What else has this author written? Do these build / complement this text?
• (Optional) Has anyone else reviewed this article? What did they say? Do I agree with them?

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Organising your writing

You first need to summarise the text that you have read. One reason to summarise the text is that the reader may not have read the text. In your summary, you will

• focus on points within the article that you think are interesting
• summarise the author(s) main ideas or argument
• explain how these ideas / argument have been constructed. (For example, is the author basing her arguments on data that they have collected? Are the main ideas / argument purely theoretical?)

In your summary you might answer the following questions:     Why is this topic important?     Where can this text be located? For example, does it address policy studies?     What other prominent authors also write about this?

Evaluation is the most important part in a critical review.

Use the literature to support your views. You may also use your knowledge of conducting research, and your own experience. Evaluation can be explicit or implicit.

Explicit evaluation

Explicit evaluation involves stating directly (explicitly) how you intend to evaluate the text. e.g. "I will review this article by focusing on the following questions. First, I will examine the extent to which the authors contribute to current thought on Second Language Acquisition (SLA) pedagogy. After that, I will analyse whether the authors' propositions are feasible within overseas SLA classrooms."

Implicit evaluation

Implicit evaluation is less direct. The following section on Linguistic Features of Writing a Critical Review contains language that evaluates the text. A difficult part of evaluation of a published text (and a professional author) is how to do this as a student. There is nothing wrong with making your position as a student explicit and incorporating it into your evaluation. Examples of how you might do this can be found in the section on Linguistic Features of Writing a Critical Review. You need to remember to locate and analyse the author's argument when you are writing your critical review. For example, you need to locate the authors' view of classroom pedagogy as presented in the book / article and not present a critique of views of classroom pedagogy in general.

Linguistic features of a critical review

The following examples come from published critical reviews. Some of them have been adapted for student use.

Summary language

•     This article / book is divided into two / three parts. First...
•     While the title might suggest...
•     The tone appears to be...
•     Title is the first / second volume in the series Title, edited by...The books / articles in this series address...
•     The second / third claim is based on...
•     The author challenges the notion that...
•     The author tries to find a more middle ground / make more modest claims...
•     The article / book begins with a short historical overview of...
•     Numerous authors have recently suggested that...(see Author, Year; Author, Year). Author would also be once such author. With his / her argument that...
•     To refer to title as a...is not to say that it is...
•     This book / article is aimed at... This intended readership...
•     The author's book / article examines the...To do this, the author first...
•     The author develops / suggests a theoretical / pedagogical model to…
•     This book / article positions itself firmly within the field of...
•     The author in a series of subtle arguments, indicates that he / she...
•     The argument is therefore...
•     The author asks "..."
•     With a purely critical / postmodern take on...
•     Topic, as the author points out, can be viewed as...
•     In this recent contribution to the field of...this British author...
•     As a leading author in the field of...
•     This book / article nicely contributes to the field of...and complements other work by this author...
•     The second / third part of...provides / questions / asks the reader...
•     Title is intended to encourage students / researchers to...
•     The approach taken by the author provides the opportunity to examine...in a qualitative / quantitative research framework that nicely complements...
•     The author notes / claims that state support / a focus on pedagogy / the adoption of...remains vital if...
•     According to Author (Year) teaching towards examinations is not as effective as it is in other areas of the curriculum. This is because, as Author (Year) claims that examinations have undue status within the curriculum.
•     According to Author (Year)…is not as effective in some areas of the curriculum / syllabus as others. Therefore the author believes that this is a reason for some school's…

Evaluation language

•     This argument is not entirely convincing, as...furthermore it commodifies / rationalises the...
•     Over the last five / ten years the view of...has increasingly been viewed as 'complicated' (see Author, Year; Author, Year).
•     However, through trying to integrate...with...the author...
•     There are difficulties with such a position.
•     Inevitably, several crucial questions are left unanswered / glossed over by this insightful / timely / interesting / stimulating book / article. Why should...
•     It might have been more relevant for the author to have written this book / article as...
•     This article / book is not without disappointment from those who would view...as...
•     This chosen framework enlightens / clouds...
•     This analysis intends to be...but falls a little short as...
•     The authors rightly conclude that if...
•     A detailed, well-written and rigorous account of...
•     As a Korean student I feel that this article / book very clearly illustrates...
•     The beginning of...provides an informative overview into...
•     The tables / figures do little to help / greatly help the reader...
•     The reaction by scholars who take a...approach might not be so favourable (e.g. Author, Year).
•     This explanation has a few weaknesses that other researchers have pointed out (see Author, Year; Author, Year). The first is...
•     On the other hand, the author wisely suggests / proposes that...By combining these two dimensions...
•     The author's brief introduction to...may leave the intended reader confused as it fails to properly...
•     Despite my inability to...I was greatly interested in...
•     Even where this reader / I disagree(s), the author's effort to...
•     The author thus combines...with...to argue...which seems quite improbable for a number of reasons. First...
•     Perhaps this aversion to...would explain the author's reluctance to...
•     As a second language student from ...I find it slightly ironic that such an anglo-centric view is...
•     The reader is rewarded with...
•     Less convincing is the broad-sweeping generalisation that...
•     There is no denying the author's subject knowledge nor his / her...
•     The author's prose is dense and littered with unnecessary jargon...
•     The author's critique of...might seem harsh but is well supported within the literature (see Author, Year; Author, Year; Author, Year). Aligning herself with the author, Author (Year) states that...
•     As it stands, the central focus of Title is well / poorly supported by its empirical findings...
•     Given the hesitation to generalise to...the limitation of...does not seem problematic...
•     For instance, the term...is never properly defined and the reader left to guess as to whether...
•     Furthermore, to label...as...inadvertently misguides...
•     In addition, this research proves to be timely / especially significant to... as recent government policy / proposals has / have been enacted to...
•     On this well researched / documented basis the author emphasises / proposes that...
•     Nonetheless, other research / scholarship / data tend to counter / contradict this possible trend / assumption...(see Author, Year; Author, Year).
•     Without entering into detail of the..., it should be stated that Title should be read by...others will see little value in...
•     As experimental conditions were not used in the study the word 'significant' misleads the reader.
•     The article / book becomes repetitious in its assertion that...
•     The thread of the author's argument becomes lost in an overuse of empirical data...
•     Almost every argument presented in the final section is largely derivative, providing little to say about...
•     She / he does not seem to take into consideration; however, that there are fundamental differences in the conditions of…
•     As Author (Year) points out, however, it seems to be necessary to look at…
•     This suggest that having low…does not necessarily indicate that…is ineffective.
•     Therefore, the suggestion made by Author (Year)…is difficult to support.
•     When considering all the data presented…it is not clear that the low scores of some students, indeed, reflects…

Conclusion language

•     Overall this article / book is an analytical look at...which within the field of...is often overlooked.
•     Despite its problems, Title offers valuable theoretical insights / interesting examples / a contribution to pedagogy and a starting point for students / researchers of...with an interest in...
•     This detailed and rigorously argued...
•     This first / second volume / book / article by...with an interest in...is highly informative...

Example extracts from a critical review

Writing critically.

If you have been told your writing is not critical enough, it probably means that your writing treats the knowledge claims as if they are true, well supported, and applicable in the context you are writing about. This may not always be the case.

In these two examples, the extracts refer to the same section of text. In each example, the section that refers to a source has been highlighted in bold. The note below the example then explains how the writer has used the source material.    

There is a strong positive effect on students, both educationally and emotionally, when the instructors try to learn to say students' names without making pronunciation errors (Kiang, 2004).

Use of source material in example a: 

This is a simple paraphrase with no critical comment. It looks like the writer agrees with Kiang. (This is not a good example for critical writing, as the writer has not made any critical comment).        

Kiang (2004) gives various examples to support his claim that "the positive emotional and educational impact on students is clear" (p.210) when instructors try to pronounce students' names in the correct way. He quotes one student, Nguyet, as saying that he "felt surprised and happy" (p.211) when the tutor said his name clearly . The emotional effect claimed by Kiang is illustrated in quotes such as these, although the educational impact is supported more indirectly through the chapter. Overall, he provides more examples of students being negatively affected by incorrect pronunciation, and it is difficult to find examples within the text of a positive educational impact as such.

Use of source material in example b: 

The writer describes Kiang's (2004) claim and the examples which he uses to try to support it. The writer then comments that the examples do not seem balanced and may not be enough to support the claims fully. This is a better example of writing which expresses criticality.

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Lau F, Kuziemsky C, editors. Handbook of eHealth Evaluation: An Evidence-based Approach [Internet]. Victoria (BC): University of Victoria; 2017 Feb 27.

Handbook of eHealth Evaluation: An Evidence-based Approach [Internet].

Chapter 9 methods for literature reviews.

Guy Paré and Spyros Kitsiou .

9.1. Introduction

Literature reviews play a critical role in scholarship because science remains, first and foremost, a cumulative endeavour ( vom Brocke et al., 2009 ). As in any academic discipline, rigorous knowledge syntheses are becoming indispensable in keeping up with an exponentially growing eHealth literature, assisting practitioners, academics, and graduate students in finding, evaluating, and synthesizing the contents of many empirical and conceptual papers. Among other methods, literature reviews are essential for: (a) identifying what has been written on a subject or topic; (b) determining the extent to which a specific research area reveals any interpretable trends or patterns; (c) aggregating empirical findings related to a narrow research question to support evidence-based practice; (d) generating new frameworks and theories; and (e) identifying topics or questions requiring more investigation ( Paré, Trudel, Jaana, & Kitsiou, 2015 ).

Literature reviews can take two major forms. The most prevalent one is the “literature review” or “background” section within a journal paper or a chapter in a graduate thesis. This section synthesizes the extant literature and usually identifies the gaps in knowledge that the empirical study addresses ( Sylvester, Tate, & Johnstone, 2013 ). It may also provide a theoretical foundation for the proposed study, substantiate the presence of the research problem, justify the research as one that contributes something new to the cumulated knowledge, or validate the methods and approaches for the proposed study ( Hart, 1998 ; Levy & Ellis, 2006 ).

The second form of literature review, which is the focus of this chapter, constitutes an original and valuable work of research in and of itself ( Paré et al., 2015 ). Rather than providing a base for a researcher’s own work, it creates a solid starting point for all members of the community interested in a particular area or topic ( Mulrow, 1987 ). The so-called “review article” is a journal-length paper which has an overarching purpose to synthesize the literature in a field, without collecting or analyzing any primary data ( Green, Johnson, & Adams, 2006 ).

When appropriately conducted, review articles represent powerful information sources for practitioners looking for state-of-the art evidence to guide their decision-making and work practices ( Paré et al., 2015 ). Further, high-quality reviews become frequently cited pieces of work which researchers seek out as a first clear outline of the literature when undertaking empirical studies ( Cooper, 1988 ; Rowe, 2014 ). Scholars who track and gauge the impact of articles have found that review papers are cited and downloaded more often than any other type of published article ( Cronin, Ryan, & Coughlan, 2008 ; Montori, Wilczynski, Morgan, Haynes, & Hedges, 2003 ; Patsopoulos, Analatos, & Ioannidis, 2005 ). The reason for their popularity may be the fact that reading the review enables one to have an overview, if not a detailed knowledge of the area in question, as well as references to the most useful primary sources ( Cronin et al., 2008 ). Although they are not easy to conduct, the commitment to complete a review article provides a tremendous service to one’s academic community ( Paré et al., 2015 ; Petticrew & Roberts, 2006 ). Most, if not all, peer-reviewed journals in the fields of medical informatics publish review articles of some type.

The main objectives of this chapter are fourfold: (a) to provide an overview of the major steps and activities involved in conducting a stand-alone literature review; (b) to describe and contrast the different types of review articles that can contribute to the eHealth knowledge base; (c) to illustrate each review type with one or two examples from the eHealth literature; and (d) to provide a series of recommendations for prospective authors of review articles in this domain.

9.2. Overview of the Literature Review Process and Steps

As explained in Templier and Paré (2015) , there are six generic steps involved in conducting a review article:

• formulating the research question(s) and objective(s),
• searching the extant literature,
• screening for inclusion,
• assessing the quality of primary studies,
• extracting data, and
• analyzing data.

Although these steps are presented here in sequential order, one must keep in mind that the review process can be iterative and that many activities can be initiated during the planning stage and later refined during subsequent phases ( Finfgeld-Connett & Johnson, 2013 ; Kitchenham & Charters, 2007 ).

Formulating the research question(s) and objective(s): As a first step, members of the review team must appropriately justify the need for the review itself ( Petticrew & Roberts, 2006 ), identify the review’s main objective(s) ( Okoli & Schabram, 2010 ), and define the concepts or variables at the heart of their synthesis ( Cooper & Hedges, 2009 ; Webster & Watson, 2002 ). Importantly, they also need to articulate the research question(s) they propose to investigate ( Kitchenham & Charters, 2007 ). In this regard, we concur with Jesson, Matheson, and Lacey (2011) that clearly articulated research questions are key ingredients that guide the entire review methodology; they underscore the type of information that is needed, inform the search for and selection of relevant literature, and guide or orient the subsequent analysis. Searching the extant literature: The next step consists of searching the literature and making decisions about the suitability of material to be considered in the review ( Cooper, 1988 ). There exist three main coverage strategies. First, exhaustive coverage means an effort is made to be as comprehensive as possible in order to ensure that all relevant studies, published and unpublished, are included in the review and, thus, conclusions are based on this all-inclusive knowledge base. The second type of coverage consists of presenting materials that are representative of most other works in a given field or area. Often authors who adopt this strategy will search for relevant articles in a small number of top-tier journals in a field ( Paré et al., 2015 ). In the third strategy, the review team concentrates on prior works that have been central or pivotal to a particular topic. This may include empirical studies or conceptual papers that initiated a line of investigation, changed how problems or questions were framed, introduced new methods or concepts, or engendered important debate ( Cooper, 1988 ). Screening for inclusion: The following step consists of evaluating the applicability of the material identified in the preceding step ( Levy & Ellis, 2006 ; vom Brocke et al., 2009 ). Once a group of potential studies has been identified, members of the review team must screen them to determine their relevance ( Petticrew & Roberts, 2006 ). A set of predetermined rules provides a basis for including or excluding certain studies. This exercise requires a significant investment on the part of researchers, who must ensure enhanced objectivity and avoid biases or mistakes. As discussed later in this chapter, for certain types of reviews there must be at least two independent reviewers involved in the screening process and a procedure to resolve disagreements must also be in place ( Liberati et al., 2009 ; Shea et al., 2009 ). Assessing the quality of primary studies: In addition to screening material for inclusion, members of the review team may need to assess the scientific quality of the selected studies, that is, appraise the rigour of the research design and methods. Such formal assessment, which is usually conducted independently by at least two coders, helps members of the review team refine which studies to include in the final sample, determine whether or not the differences in quality may affect their conclusions, or guide how they analyze the data and interpret the findings ( Petticrew & Roberts, 2006 ). Ascribing quality scores to each primary study or considering through domain-based evaluations which study components have or have not been designed and executed appropriately makes it possible to reflect on the extent to which the selected study addresses possible biases and maximizes validity ( Shea et al., 2009 ). Extracting data: The following step involves gathering or extracting applicable information from each primary study included in the sample and deciding what is relevant to the problem of interest ( Cooper & Hedges, 2009 ). Indeed, the type of data that should be recorded mainly depends on the initial research questions ( Okoli & Schabram, 2010 ). However, important information may also be gathered about how, when, where and by whom the primary study was conducted, the research design and methods, or qualitative/quantitative results ( Cooper & Hedges, 2009 ). Analyzing and synthesizing data : As a final step, members of the review team must collate, summarize, aggregate, organize, and compare the evidence extracted from the included studies. The extracted data must be presented in a meaningful way that suggests a new contribution to the extant literature ( Jesson et al., 2011 ). Webster and Watson (2002) warn researchers that literature reviews should be much more than lists of papers and should provide a coherent lens to make sense of extant knowledge on a given topic. There exist several methods and techniques for synthesizing quantitative (e.g., frequency analysis, meta-analysis) and qualitative (e.g., grounded theory, narrative analysis, meta-ethnography) evidence ( Dixon-Woods, Agarwal, Jones, Young, & Sutton, 2005 ; Thomas & Harden, 2008 ).

9.3. Types of Review Articles and Brief Illustrations

EHealth researchers have at their disposal a number of approaches and methods for making sense out of existing literature, all with the purpose of casting current research findings into historical contexts or explaining contradictions that might exist among a set of primary research studies conducted on a particular topic. Our classification scheme is largely inspired from Paré and colleagues’ (2015) typology. Below we present and illustrate those review types that we feel are central to the growth and development of the eHealth domain.

9.3.1. Narrative Reviews

The narrative review is the “traditional” way of reviewing the extant literature and is skewed towards a qualitative interpretation of prior knowledge ( Sylvester et al., 2013 ). Put simply, a narrative review attempts to summarize or synthesize what has been written on a particular topic but does not seek generalization or cumulative knowledge from what is reviewed ( Davies, 2000 ; Green et al., 2006 ). Instead, the review team often undertakes the task of accumulating and synthesizing the literature to demonstrate the value of a particular point of view ( Baumeister & Leary, 1997 ). As such, reviewers may selectively ignore or limit the attention paid to certain studies in order to make a point. In this rather unsystematic approach, the selection of information from primary articles is subjective, lacks explicit criteria for inclusion and can lead to biased interpretations or inferences ( Green et al., 2006 ). There are several narrative reviews in the particular eHealth domain, as in all fields, which follow such an unstructured approach ( Silva et al., 2015 ; Paul et al., 2015 ).

Despite these criticisms, this type of review can be very useful in gathering together a volume of literature in a specific subject area and synthesizing it. As mentioned above, its primary purpose is to provide the reader with a comprehensive background for understanding current knowledge and highlighting the significance of new research ( Cronin et al., 2008 ). Faculty like to use narrative reviews in the classroom because they are often more up to date than textbooks, provide a single source for students to reference, and expose students to peer-reviewed literature ( Green et al., 2006 ). For researchers, narrative reviews can inspire research ideas by identifying gaps or inconsistencies in a body of knowledge, thus helping researchers to determine research questions or formulate hypotheses. Importantly, narrative reviews can also be used as educational articles to bring practitioners up to date with certain topics of issues ( Green et al., 2006 ).

Recently, there have been several efforts to introduce more rigour in narrative reviews that will elucidate common pitfalls and bring changes into their publication standards. Information systems researchers, among others, have contributed to advancing knowledge on how to structure a “traditional” review. For instance, Levy and Ellis (2006) proposed a generic framework for conducting such reviews. Their model follows the systematic data processing approach comprised of three steps, namely: (a) literature search and screening; (b) data extraction and analysis; and (c) writing the literature review. They provide detailed and very helpful instructions on how to conduct each step of the review process. As another methodological contribution, vom Brocke et al. (2009) offered a series of guidelines for conducting literature reviews, with a particular focus on how to search and extract the relevant body of knowledge. Last, Bandara, Miskon, and Fielt (2011) proposed a structured, predefined and tool-supported method to identify primary studies within a feasible scope, extract relevant content from identified articles, synthesize and analyze the findings, and effectively write and present the results of the literature review. We highly recommend that prospective authors of narrative reviews consult these useful sources before embarking on their work.

Darlow and Wen (2015) provide a good example of a highly structured narrative review in the eHealth field. These authors synthesized published articles that describe the development process of mobile health ( m-health ) interventions for patients’ cancer care self-management. As in most narrative reviews, the scope of the research questions being investigated is broad: (a) how development of these systems are carried out; (b) which methods are used to investigate these systems; and (c) what conclusions can be drawn as a result of the development of these systems. To provide clear answers to these questions, a literature search was conducted on six electronic databases and Google Scholar . The search was performed using several terms and free text words, combining them in an appropriate manner. Four inclusion and three exclusion criteria were utilized during the screening process. Both authors independently reviewed each of the identified articles to determine eligibility and extract study information. A flow diagram shows the number of studies identified, screened, and included or excluded at each stage of study selection. In terms of contributions, this review provides a series of practical recommendations for m-health intervention development.

9.3.2. Descriptive or Mapping Reviews

The primary goal of a descriptive review is to determine the extent to which a body of knowledge in a particular research topic reveals any interpretable pattern or trend with respect to pre-existing propositions, theories, methodologies or findings ( King & He, 2005 ; Paré et al., 2015 ). In contrast with narrative reviews, descriptive reviews follow a systematic and transparent procedure, including searching, screening and classifying studies ( Petersen, Vakkalanka, & Kuzniarz, 2015 ). Indeed, structured search methods are used to form a representative sample of a larger group of published works ( Paré et al., 2015 ). Further, authors of descriptive reviews extract from each study certain characteristics of interest, such as publication year, research methods, data collection techniques, and direction or strength of research outcomes (e.g., positive, negative, or non-significant) in the form of frequency analysis to produce quantitative results ( Sylvester et al., 2013 ). In essence, each study included in a descriptive review is treated as the unit of analysis and the published literature as a whole provides a database from which the authors attempt to identify any interpretable trends or draw overall conclusions about the merits of existing conceptualizations, propositions, methods or findings ( Paré et al., 2015 ). In doing so, a descriptive review may claim that its findings represent the state of the art in a particular domain ( King & He, 2005 ).

In the fields of health sciences and medical informatics, reviews that focus on examining the range, nature and evolution of a topic area are described by Anderson, Allen, Peckham, and Goodwin (2008) as mapping reviews . Like descriptive reviews, the research questions are generic and usually relate to publication patterns and trends. There is no preconceived plan to systematically review all of the literature although this can be done. Instead, researchers often present studies that are representative of most works published in a particular area and they consider a specific time frame to be mapped.

An example of this approach in the eHealth domain is offered by DeShazo, Lavallie, and Wolf (2009). The purpose of this descriptive or mapping review was to characterize publication trends in the medical informatics literature over a 20-year period (1987 to 2006). To achieve this ambitious objective, the authors performed a bibliometric analysis of medical informatics citations indexed in medline using publication trends, journal frequencies, impact factors, Medical Subject Headings (MeSH) term frequencies, and characteristics of citations. Findings revealed that there were over 77,000 medical informatics articles published during the covered period in numerous journals and that the average annual growth rate was 12%. The MeSH term analysis also suggested a strong interdisciplinary trend. Finally, average impact scores increased over time with two notable growth periods. Overall, patterns in research outputs that seem to characterize the historic trends and current components of the field of medical informatics suggest it may be a maturing discipline (DeShazo et al., 2009).

9.3.3. Scoping Reviews

Scoping reviews attempt to provide an initial indication of the potential size and nature of the extant literature on an emergent topic (Arksey & O’Malley, 2005; Daudt, van Mossel, & Scott, 2013 ; Levac, Colquhoun, & O’Brien, 2010). A scoping review may be conducted to examine the extent, range and nature of research activities in a particular area, determine the value of undertaking a full systematic review (discussed next), or identify research gaps in the extant literature ( Paré et al., 2015 ). In line with their main objective, scoping reviews usually conclude with the presentation of a detailed research agenda for future works along with potential implications for both practice and research.

Unlike narrative and descriptive reviews, the whole point of scoping the field is to be as comprehensive as possible, including grey literature (Arksey & O’Malley, 2005). Inclusion and exclusion criteria must be established to help researchers eliminate studies that are not aligned with the research questions. It is also recommended that at least two independent coders review abstracts yielded from the search strategy and then the full articles for study selection ( Daudt et al., 2013 ). The synthesized evidence from content or thematic analysis is relatively easy to present in tabular form (Arksey & O’Malley, 2005; Thomas & Harden, 2008 ).

One of the most highly cited scoping reviews in the eHealth domain was published by Archer, Fevrier-Thomas, Lokker, McKibbon, and Straus (2011) . These authors reviewed the existing literature on personal health record ( phr ) systems including design, functionality, implementation, applications, outcomes, and benefits. Seven databases were searched from 1985 to March 2010. Several search terms relating to phr s were used during this process. Two authors independently screened titles and abstracts to determine inclusion status. A second screen of full-text articles, again by two independent members of the research team, ensured that the studies described phr s. All in all, 130 articles met the criteria and their data were extracted manually into a database. The authors concluded that although there is a large amount of survey, observational, cohort/panel, and anecdotal evidence of phr benefits and satisfaction for patients, more research is needed to evaluate the results of phr implementations. Their in-depth analysis of the literature signalled that there is little solid evidence from randomized controlled trials or other studies through the use of phr s. Hence, they suggested that more research is needed that addresses the current lack of understanding of optimal functionality and usability of these systems, and how they can play a beneficial role in supporting patient self-management ( Archer et al., 2011 ).

9.3.4. Forms of Aggregative Reviews

Healthcare providers, practitioners, and policy-makers are nowadays overwhelmed with large volumes of information, including research-based evidence from numerous clinical trials and evaluation studies, assessing the effectiveness of health information technologies and interventions ( Ammenwerth & de Keizer, 2004 ; Deshazo et al., 2009 ). It is unrealistic to expect that all these disparate actors will have the time, skills, and necessary resources to identify the available evidence in the area of their expertise and consider it when making decisions. Systematic reviews that involve the rigorous application of scientific strategies aimed at limiting subjectivity and bias (i.e., systematic and random errors) can respond to this challenge.

Systematic reviews attempt to aggregate, appraise, and synthesize in a single source all empirical evidence that meet a set of previously specified eligibility criteria in order to answer a clearly formulated and often narrow research question on a particular topic of interest to support evidence-based practice ( Liberati et al., 2009 ). They adhere closely to explicit scientific principles ( Liberati et al., 2009 ) and rigorous methodological guidelines (Higgins & Green, 2008) aimed at reducing random and systematic errors that can lead to deviations from the truth in results or inferences. The use of explicit methods allows systematic reviews to aggregate a large body of research evidence, assess whether effects or relationships are in the same direction and of the same general magnitude, explain possible inconsistencies between study results, and determine the strength of the overall evidence for every outcome of interest based on the quality of included studies and the general consistency among them ( Cook, Mulrow, & Haynes, 1997 ). The main procedures of a systematic review involve:

• Formulating a review question and developing a search strategy based on explicit inclusion criteria for the identification of eligible studies (usually described in the context of a detailed review protocol).
• Searching for eligible studies using multiple databases and information sources, including grey literature sources, without any language restrictions.
• Selecting studies, extracting data, and assessing risk of bias in a duplicate manner using two independent reviewers to avoid random or systematic errors in the process.
• Analyzing data using quantitative or qualitative methods.
• Presenting results in summary of findings tables.
• Interpreting results and drawing conclusions.

Many systematic reviews, but not all, use statistical methods to combine the results of independent studies into a single quantitative estimate or summary effect size. Known as meta-analyses , these reviews use specific data extraction and statistical techniques (e.g., network, frequentist, or Bayesian meta-analyses) to calculate from each study by outcome of interest an effect size along with a confidence interval that reflects the degree of uncertainty behind the point estimate of effect ( Borenstein, Hedges, Higgins, & Rothstein, 2009 ; Deeks, Higgins, & Altman, 2008 ). Subsequently, they use fixed or random-effects analysis models to combine the results of the included studies, assess statistical heterogeneity, and calculate a weighted average of the effect estimates from the different studies, taking into account their sample sizes. The summary effect size is a value that reflects the average magnitude of the intervention effect for a particular outcome of interest or, more generally, the strength of a relationship between two variables across all studies included in the systematic review. By statistically combining data from multiple studies, meta-analyses can create more precise and reliable estimates of intervention effects than those derived from individual studies alone, when these are examined independently as discrete sources of information.

The review by Gurol-Urganci, de Jongh, Vodopivec-Jamsek, Atun, and Car (2013) on the effects of mobile phone messaging reminders for attendance at healthcare appointments is an illustrative example of a high-quality systematic review with meta-analysis. Missed appointments are a major cause of inefficiency in healthcare delivery with substantial monetary costs to health systems. These authors sought to assess whether mobile phone-based appointment reminders delivered through Short Message Service ( sms ) or Multimedia Messaging Service ( mms ) are effective in improving rates of patient attendance and reducing overall costs. To this end, they conducted a comprehensive search on multiple databases using highly sensitive search strategies without language or publication-type restrictions to identify all rct s that are eligible for inclusion. In order to minimize the risk of omitting eligible studies not captured by the original search, they supplemented all electronic searches with manual screening of trial registers and references contained in the included studies. Study selection, data extraction, and risk of bias assessments were performed inde­­pen­dently by two coders using standardized methods to ensure consistency and to eliminate potential errors. Findings from eight rct s involving 6,615 participants were pooled into meta-analyses to calculate the magnitude of effects that mobile text message reminders have on the rate of attendance at healthcare appointments compared to no reminders and phone call reminders.

Meta-analyses are regarded as powerful tools for deriving meaningful conclusions. However, there are situations in which it is neither reasonable nor appropriate to pool studies together using meta-analytic methods simply because there is extensive clinical heterogeneity between the included studies or variation in measurement tools, comparisons, or outcomes of interest. In these cases, systematic reviews can use qualitative synthesis methods such as vote counting, content analysis, classification schemes and tabulations, as an alternative approach to narratively synthesize the results of the independent studies included in the review. This form of review is known as qualitative systematic review.

A rigorous example of one such review in the eHealth domain is presented by Mickan, Atherton, Roberts, Heneghan, and Tilson (2014) on the use of handheld computers by healthcare professionals and their impact on access to information and clinical decision-making. In line with the methodological guide­lines for systematic reviews, these authors: (a) developed and registered with prospero ( www.crd.york.ac.uk/ prospero / ) an a priori review protocol; (b) conducted comprehensive searches for eligible studies using multiple databases and other supplementary strategies (e.g., forward searches); and (c) subsequently carried out study selection, data extraction, and risk of bias assessments in a duplicate manner to eliminate potential errors in the review process. Heterogeneity between the included studies in terms of reported outcomes and measures precluded the use of meta-analytic methods. To this end, the authors resorted to using narrative analysis and synthesis to describe the effectiveness of handheld computers on accessing information for clinical knowledge, adherence to safety and clinical quality guidelines, and diagnostic decision-making.

In recent years, the number of systematic reviews in the field of health informatics has increased considerably. Systematic reviews with discordant findings can cause great confusion and make it difficult for decision-makers to interpret the review-level evidence ( Moher, 2013 ). Therefore, there is a growing need for appraisal and synthesis of prior systematic reviews to ensure that decision-making is constantly informed by the best available accumulated evidence. Umbrella reviews , also known as overviews of systematic reviews, are tertiary types of evidence synthesis that aim to accomplish this; that is, they aim to compare and contrast findings from multiple systematic reviews and meta-analyses ( Becker & Oxman, 2008 ). Umbrella reviews generally adhere to the same principles and rigorous methodological guidelines used in systematic reviews. However, the unit of analysis in umbrella reviews is the systematic review rather than the primary study ( Becker & Oxman, 2008 ). Unlike systematic reviews that have a narrow focus of inquiry, umbrella reviews focus on broader research topics for which there are several potential interventions ( Smith, Devane, Begley, & Clarke, 2011 ). A recent umbrella review on the effects of home telemonitoring interventions for patients with heart failure critically appraised, compared, and synthesized evidence from 15 systematic reviews to investigate which types of home telemonitoring technologies and forms of interventions are more effective in reducing mortality and hospital admissions ( Kitsiou, Paré, & Jaana, 2015 ).

9.3.5. Realist Reviews

Realist reviews are theory-driven interpretative reviews developed to inform, enhance, or supplement conventional systematic reviews by making sense of heterogeneous evidence about complex interventions applied in diverse contexts in a way that informs policy decision-making ( Greenhalgh, Wong, Westhorp, & Pawson, 2011 ). They originated from criticisms of positivist systematic reviews which centre on their “simplistic” underlying assumptions ( Oates, 2011 ). As explained above, systematic reviews seek to identify causation. Such logic is appropriate for fields like medicine and education where findings of randomized controlled trials can be aggregated to see whether a new treatment or intervention does improve outcomes. However, many argue that it is not possible to establish such direct causal links between interventions and outcomes in fields such as social policy, management, and information systems where for any intervention there is unlikely to be a regular or consistent outcome ( Oates, 2011 ; Pawson, 2006 ; Rousseau, Manning, & Denyer, 2008 ).

To circumvent these limitations, Pawson, Greenhalgh, Harvey, and Walshe (2005) have proposed a new approach for synthesizing knowledge that seeks to unpack the mechanism of how “complex interventions” work in particular contexts. The basic research question — what works? — which is usually associated with systematic reviews changes to: what is it about this intervention that works, for whom, in what circumstances, in what respects and why? Realist reviews have no particular preference for either quantitative or qualitative evidence. As a theory-building approach, a realist review usually starts by articulating likely underlying mechanisms and then scrutinizes available evidence to find out whether and where these mechanisms are applicable ( Shepperd et al., 2009 ). Primary studies found in the extant literature are viewed as case studies which can test and modify the initial theories ( Rousseau et al., 2008 ).

The main objective pursued in the realist review conducted by Otte-Trojel, de Bont, Rundall, and van de Klundert (2014) was to examine how patient portals contribute to health service delivery and patient outcomes. The specific goals were to investigate how outcomes are produced and, most importantly, how variations in outcomes can be explained. The research team started with an exploratory review of background documents and research studies to identify ways in which patient portals may contribute to health service delivery and patient outcomes. The authors identified six main ways which represent “educated guesses” to be tested against the data in the evaluation studies. These studies were identified through a formal and systematic search in four databases between 2003 and 2013. Two members of the research team selected the articles using a pre-established list of inclusion and exclusion criteria and following a two-step procedure. The authors then extracted data from the selected articles and created several tables, one for each outcome category. They organized information to bring forward those mechanisms where patient portals contribute to outcomes and the variation in outcomes across different contexts.

9.3.6. Critical Reviews

Lastly, critical reviews aim to provide a critical evaluation and interpretive analysis of existing literature on a particular topic of interest to reveal strengths, weaknesses, contradictions, controversies, inconsistencies, and/or other important issues with respect to theories, hypotheses, research methods or results ( Baumeister & Leary, 1997 ; Kirkevold, 1997 ). Unlike other review types, critical reviews attempt to take a reflective account of the research that has been done in a particular area of interest, and assess its credibility by using appraisal instruments or critical interpretive methods. In this way, critical reviews attempt to constructively inform other scholars about the weaknesses of prior research and strengthen knowledge development by giving focus and direction to studies for further improvement ( Kirkevold, 1997 ).

Kitsiou, Paré, and Jaana (2013) provide an example of a critical review that assessed the methodological quality of prior systematic reviews of home telemonitoring studies for chronic patients. The authors conducted a comprehensive search on multiple databases to identify eligible reviews and subsequently used a validated instrument to conduct an in-depth quality appraisal. Results indicate that the majority of systematic reviews in this particular area suffer from important methodological flaws and biases that impair their internal validity and limit their usefulness for clinical and decision-making purposes. To this end, they provide a number of recommendations to strengthen knowledge development towards improving the design and execution of future reviews on home telemonitoring.

9.4. Summary

Table 9.1 outlines the main types of literature reviews that were described in the previous sub-sections and summarizes the main characteristics that distinguish one review type from another. It also includes key references to methodological guidelines and useful sources that can be used by eHealth scholars and researchers for planning and developing reviews.

Typology of Literature Reviews (adapted from Paré et al., 2015).

As shown in Table 9.1 , each review type addresses different kinds of research questions or objectives, which subsequently define and dictate the methods and approaches that need to be used to achieve the overarching goal(s) of the review. For example, in the case of narrative reviews, there is greater flexibility in searching and synthesizing articles ( Green et al., 2006 ). Researchers are often relatively free to use a diversity of approaches to search, identify, and select relevant scientific articles, describe their operational characteristics, present how the individual studies fit together, and formulate conclusions. On the other hand, systematic reviews are characterized by their high level of systematicity, rigour, and use of explicit methods, based on an “a priori” review plan that aims to minimize bias in the analysis and synthesis process (Higgins & Green, 2008). Some reviews are exploratory in nature (e.g., scoping/mapping reviews), whereas others may be conducted to discover patterns (e.g., descriptive reviews) or involve a synthesis approach that may include the critical analysis of prior research ( Paré et al., 2015 ). Hence, in order to select the most appropriate type of review, it is critical to know before embarking on a review project, why the research synthesis is conducted and what type of methods are best aligned with the pursued goals.

9.5. Concluding Remarks

In light of the increased use of evidence-based practice and research generating stronger evidence ( Grady et al., 2011 ; Lyden et al., 2013 ), review articles have become essential tools for summarizing, synthesizing, integrating or critically appraising prior knowledge in the eHealth field. As mentioned earlier, when rigorously conducted review articles represent powerful information sources for eHealth scholars and practitioners looking for state-of-the-art evidence. The typology of literature reviews we used herein will allow eHealth researchers, graduate students and practitioners to gain a better understanding of the similarities and differences between review types.

We must stress that this classification scheme does not privilege any specific type of review as being of higher quality than another ( Paré et al., 2015 ). As explained above, each type of review has its own strengths and limitations. Having said that, we realize that the methodological rigour of any review — be it qualitative, quantitative or mixed — is a critical aspect that should be considered seriously by prospective authors. In the present context, the notion of rigour refers to the reliability and validity of the review process described in section 9.2. For one thing, reliability is related to the reproducibility of the review process and steps, which is facilitated by a comprehensive documentation of the literature search process, extraction, coding and analysis performed in the review. Whether the search is comprehensive or not, whether it involves a methodical approach for data extraction and synthesis or not, it is important that the review documents in an explicit and transparent manner the steps and approach that were used in the process of its development. Next, validity characterizes the degree to which the review process was conducted appropriately. It goes beyond documentation and reflects decisions related to the selection of the sources, the search terms used, the period of time covered, the articles selected in the search, and the application of backward and forward searches ( vom Brocke et al., 2009 ). In short, the rigour of any review article is reflected by the explicitness of its methods (i.e., transparency) and the soundness of the approach used. We refer those interested in the concepts of rigour and quality to the work of Templier and Paré (2015) which offers a detailed set of methodological guidelines for conducting and evaluating various types of review articles.

To conclude, our main objective in this chapter was to demystify the various types of literature reviews that are central to the continuous development of the eHealth field. It is our hope that our descriptive account will serve as a valuable source for those conducting, evaluating or using reviews in this important and growing domain.

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• Cite this Page Paré G, Kitsiou S. Chapter 9 Methods for Literature Reviews. In: Lau F, Kuziemsky C, editors. Handbook of eHealth Evaluation: An Evidence-based Approach [Internet]. Victoria (BC): University of Victoria; 2017 Feb 27.
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Taylor Swift’s Tortured Poetry

By Amanda Petrusich

In the past several months, Taylor Swift has become culturally ubiquitous in a way that feels nearly terrifying. Superstardom tends to turn normal people into cartoons, projections, gods, monsters. Swift has been inching toward some sort of tipping point for a while. The most recent catalyst was, in part, love: in the midst of her record-breaking Eras Tour , Swift, who is thirty-four, began dating Travis Kelce , a tight end for the Kansas City Chiefs. Whenever Swift appeared at one of Kelce’s games, the broadcasters whipped their extra-high-definition cameras toward her, sending legions of amateur lip-readers scrambling for their phones. I’m paid to give legibility to such things, and even I couldn’t help but think that we were crossing some sort of Rubicon with regard to our collective sanity. Swift was everywhere, beheld by everyone. She is one of the most streamed artists of all time on Spotify; Billboard reported that, at one point, she accounted for seven per cent of all vinyl sales in the U.S. Swift is a capable and hugely savvy businesswoman (a billionaire, in fact), yet I began to worry about her in a nearly maternal way: How could anyone survive that sort of scrutiny and retain her humanity? Detaching from reality can be lethal for a pop star, particularly one known for her Everygirl candor. I thought of the oft-memed bit from “Arrested Development,” in which Lucille Bluth, the oblivious matriarch, asks, “I mean, it’s one banana, Michael—what could it cost? Ten dollars?”

This month, Swift released “The Tortured Poets Department,” her eleventh studio album. She has now reached a level of virtuosity within her genre that feels nearly immutable—she’s too practiced, too masterly, to swing and really miss. But “The Tortured Poets Department” suffers from being too long (two hours after it was released, Swift announced a second disk, bringing the total number of tracks to thirty-one) and too familiar. Swift co-wrote most of the record with Jack Antonoff and with Aaron Dessner. (The two producers have oppositional melodic sensibilities: Antonoff sharpens Swift; Dessner softens her.) The new songs suggest that, after a decade, her partnership with Antonoff has perhaps run its course. The tracks written with Dessner are gentler, more tender, and more surprising. The raw and stirring “Robin” seems to address a child—either a very young Swift (the album contains several references to her hijacked youth, including “The Manuscript,” a sombre song about a relationship with an older man), or maybe a future son or daughter.

“The Tortured Poets Department” was released following the end of Swift’s six-year relationship with the actor Joe Alwyn, and the album is mostly about the utter unreliability of love—how bonkers it is that we build our entire lives around a feeling that can simply dissipate. “You said I’m the love of your life / About a million times,” Swift sings on “Loml,” a wrenching piano ballad. “You shit-talked me under the table, talking rings and talking cradles.” Shortly after Swift and Alwyn split, she reportedly had a fling with Matty Healy , the front man for the British rock band the 1975. (“I took the miracle move-on drug / The effects were temporary,” she sings on “Fortnight.”) Healy is a provocateur, prone to making loutish jokes; onstage, he smokes, eats raw steak, and makes out with strangers. The rumored relationship sent Swifties into spasms of outrage, and revealed the unusual extent to which Swift is beholden to her fans. She has encouraged and nurtured a parasocial affection (at times she nearly demanded it: inviting fans to her home, baking them cookies), and she now has to contend with their sense of ownership over her life. On “But Daddy I Love Him,” she scornfully chastises the “judgmental creeps” who relentlessly hounded her about her love life: “I’d rather burn my whole life down / Than listen to one more second of all this bitching and moaning.” (She saves the nastiest barb for the final verse: “All the wine moms are still holding out.”) Regardless, things with Healy ended fast, and, a few months later, she did the most wholesome thing possible: she started dating a football player whose team would go on to win the Super Bowl.

Quite a few of the album’s lyrics seem to evoke Healy: “You’re not Dylan Thomas / I’m not Patti Smith / This ain’t the Chelsea Hotel / We’re modern idiots,” Swift sings on the title track, a shimmering song about broken people clinging to each other. I like that line—it suggests self-awareness—but it’s followed by one of the weirdest verses of Swift’s career: “You smoked then ate seven bars of chocolate / We declared Charlie Puth should be a bigger artist / I scratch your head, you fall asleep / Like a tattooed golden retriever.” Other lyrics lack Swift’s signature precision: “At dinner you take my ring off my middle finger and put it on the one people put wedding rings on,” she sings. Even the greatest poets whiff a phrase now and then, but a lot of the language on the record is either incoherent (“I was a functioning alcoholic till nobody noticed my new aesthetic”) or just generally bewildering (“Florida is one hell of a drug”). My favorite lyrics are the simplest, and are delivered with a kind of exhausted calm. On “Down Bad,” a woozy song about feeling like shit, Swift admits defeat: “Now I’m down bad, crying at the gym / Everything comes out teen-age petulance / Fuck it if I can’t have him.” Feel you, dude.

Each of Swift’s records has a distinct visual component—this is more or less the premise of the Eras Tour . “The Tortured Poets Department” is preoccupied with writerly accoutrements, but the vibe is ultimately more high-end stationery store than musty rare-books room. Initially, the title seemed as if it might be a smirking reference to Joe Alwyn (he once joked about being part of a WhatsApp group called the Tortured Man Club). But I find that the phrase works well as a summation of Swift’s entire self-conception. She has always made a big deal about her pain being generative. “This writer is of the firm belief that our tears become holy in the form of ink on the page,” she wrote on Instagram. She has talked about this album as if the songs were mere monuments to her suffering: “Once we have spoken our saddest story, we can be free of it.”

An unusual number of Swift’s songs portray love as combative, perhaps because she is so prone to working from a place of wounded longing. On “Better Than Revenge,” a song she wrote at eighteen, Swift sings about art as a useful weapon, a way to punish anyone who does her dirty: “She thinks I’m psycho / ’Cause I like to rhyme her name with things.” It’s a funny lyric, but, by Swift’s current age, most people understand that love isn’t about winning. (Art isn’t, either.) Yet, in Swift’s universe, love is often a battlefield. On “Who’s Afraid of Little Old Me?,” she catalogues the ways in which fame can pervert and destroy a person: “I was tame, I was gentle, till the circus life made me mean,” she sings. She is paranoid, wild-eyed: “Tell me everything is not about me / But what if it is ?” (After the year Swift has had, she’s not wrong to ask.) The song itself is so tightly produced that it doesn’t sound dangerous. But, midway through, her voice briefly goes feral. I found the moment thrilling, which is maybe part of the problem.

In the weeks before “The Tortured Poets Department” was released, it seemed as though a backlash was inevitable. Swift’s lyrics are often focussed on her perseverance against all odds, but, these days, she is too omnipresent and powerful to make a very convincing underdog. Still, interest in Swift has yet to diminish or fully sour. She announced the album at the Grammys, in February, as she was accepting the award for Best Pop Vocal Album, for her previous record, “Midnights.” I found her speech so profoundly mercenary it was sort of funny. “I want to say thank you to the fans by telling you a secret that I’ve been keeping from you for the last two years, which is that my brand-new album comes out April 19th,” Swift said. “I’m gonna go and post the cover.”

As I’ve grown older, I’ve mostly stopped thinking about art and commerce as being fundamentally at odds. But there are times when the rapaciousness of our current pop stars seems grasping and ugly. I’m not saying that pop music needs to be ideologically pure—it wouldn’t be much fun if it were—but maybe it’s time to cool it a little with the commercials? A couple of days before the album’s release, Swift unveiled a library-esque display at the Grove, a shopping mall in Los Angeles. It included several pages of typewritten lyrics on faux aged paper, arranged as though they had recently been tugged from the platen of a Smith Corona. (The word “talisman” was misspelled on one, to the delight of the haters.) The Spotify logo was featured prominently at the bottom of each page. Once again, I laughed. What is the point of all that money if it doesn’t buy you freedom from corporate branding? For a million reasons—her adoption of the “poet” persona; her already unprecedented streaming numbers—such an egregious display of sponsorship was worse than just incongruous. It was, as they say, cringe.

Among the other clues Swift doled out were five exclusive playlists for Apple Music (sorry, Spotify!), comprising her own songs and organized according to the five stages of grief: denial, anger, bargaining, depression, and acceptance. At first, I thought the playlists were just another bit of overwrought marketing, but the more I listened to “The Tortured Poets Department” the more germane the concept felt. Anyone who has grieved knows that these categories are not a ladder you climb toward peace: it is possible, instead, to feel all of them at once, briefly or forever. Each stage is evident on “The Tortured Poets Department.” Sometimes they oppose one another: Swift is cocky and self-loathing, tough and vulnerable, totally fine and completely destroyed. She is free, but trapped. Dominant, powerless. She wants this, but she doesn’t. Those sorts of contradictions can be dizzying, but, in the end, they’re also the last things keeping her human. ♦

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