lit review phd

• What Is a PhD Literature Review?
• Doing a PhD

A literature review is a critical analysis of published academic literature, mainly peer-reviewed papers and books, on a specific topic. This isn’t just a list of published studies but is a document summarising and critically appraising the main work by researchers in the field, the key findings, limitations and gaps identified in the knowledge.

• The aim of a literature review is to critically assess the literature in your chosen field of research and be able to present an overview of the current knowledge gained from previous work.
• By the conclusion of your literature review, you as a researcher should have identified the gaps in knowledge in your field; i.e. the unanswered research questions which your PhD project will help to answer.
• Quality not quantity is the approach to use when writing a literature review for a PhD but as a general rule of thumb, most are between 6,000 and 12,000 words.

What Is the Purpose of a Literature Review?

First, to be clear on what a PhD literature review is NOT: it is not a ‘paper by paper’ summary of what others have done in your field. All you’re doing here is listing out all the papers and book chapters you’ve found with some text joining things together. This is a common mistake made by PhD students early on in their research project. This is a sign of poor academic writing and if it’s not picked up by your supervisor, it’ll definitely be by your examiners.

The biggest issue your examiners will have here is that you won’t have demonstrated an application of critical thinking when examining existing knowledge from previous research. This is an important part of the research process as a PhD student. It’s needed to show where the gaps in knowledge were, and how then you were able to identify the novelty of each research question and subsequent work.

The five main outcomes from carrying out a good literature review should be:

• An understanding of what has been published in your subject area of research,
• An appreciation of the leading research groups and authors in your field and their key contributions to the research topic,
• Knowledge of the key theories in your field,
• Knowledge of the main research areas within your field of interest,
• A clear understanding of the research gap in knowledge that will help to motivate your PhD research questions .

When assessing the academic papers or books that you’ve come across, you must think about the strengths and weaknesses of them; what was novel about their work and what were the limitations? Are different sources of relevant literature coming to similar conclusions and complementing each other, or are you seeing different outcomes on the same topic by different researchers?

When Should I Write My Literature Review?

In the structure of your PhD thesis , your literature review is effectively your first main chapter. It’s at the start of your thesis and should, therefore, be a task you perform at the start of your research. After all, you need to have reviewed the literature to work out how your research can contribute novel findings to your area of research. Sometimes, however, in particular when you apply for a PhD project with a pre-defined research title and research questions, your supervisor may already know where the gaps in knowledge are.

You may be tempted to skip the literature review and dive straight into tackling the set questions (then completing the review at the end before thesis submission) but we strongly advise against this. Whilst your supervisor will be very familiar with the area, you as a doctoral student will not be and so it is essential that you gain this understanding before getting into the research.

How Long Should the Literature Review Be?

As your literature review will be one of your main thesis chapters, it needs to be a substantial body of work. It’s not a good strategy to have a thesis writing process here based on a specific word count, but know that most reviews are typically between 6,000 and 12,000 words. The length will depend on how much relevant material has previously been published in your field.

A point to remember though is that the review needs to be easy to read and avoid being filled with unnecessary information; in your search of selected literature, consider filtering out publications that don’t appear to add anything novel to the discussion – this might be useful in fields with hundreds of papers.

How Do I Write the Literature Review?

Before you start writing your literature review, you need to be clear on the topic you are researching.

1. Evaluating and Selecting the Publications

After completing your literature search and downloading all the papers you find, you may find that you have a lot of papers to read through ! You may find that you have so many papers that it’s unreasonable to read through all of them in their entirety, so you need to find a way to understand what they’re about and decide if they’re important quickly.

A good starting point is to read the abstract of the paper to gauge if it is useful and, as you do so, consider the following questions in your mind:

• What was the overarching aim of the paper?
• What was the methodology used by the authors?
• Was this an experimental study or was this more theoretical in its approach?
• What were the results and what did the authors conclude in their paper?
• How does the data presented in this paper relate to other publications within this field?
• Does it add new knowledge, does it raise more questions or does it confirm what is already known in your field? What is the key concept that the study described?
• What are the strengths and weaknesses of this study, and in particular, what are the limitations?

2. Identifying Themes

To put together the structure of your literature review you need to identify the common themes that emerge from the collective papers and books that you have read. Key things to think about are:

• Are there common methodologies different authors have used or have these changed over time?
• Do the research questions change over time or are the key question’s still unanswered?
• Is there general agreement between different research groups in the main results and outcomes, or do different authors provide differing points of view and different conclusions?
• What are the key papers in your field that have had the biggest impact on the research?
• Have different publications identified similar weaknesses or limitations or gaps in the knowledge that still need to be addressed?

Structuring and Writing Your Literature Review

There are several ways in which you can structure a literature review and this may depend on if, for example, your project is a science or non-science based PhD.

One approach may be to tell a story about how your research area has developed over time. You need to be careful here that you don’t just describe the different papers published in chronological order but that you discuss how different studies have motivated subsequent studies, how the knowledge has developed over time in your field, concluding with what is currently known, and what is currently not understood.

Alternatively, you may find from reading your papers that common themes emerge and it may be easier to develop your review around these, i.e. a thematic review. For example, if you are writing up about bridge design, you may structure the review around the themes of regulation, analysis, and sustainability.

As another approach, you might want to talk about the different research methodologies that have been used. You could then compare and contrast the results and ultimate conclusions that have been drawn from each.

As with all your chapters in your thesis, your literature review will be broken up into three key headings, with the basic structure being the introduction, the main body and conclusion. Within the main body, you will use several subheadings to separate out the topics depending on if you’re structuring it by the time period, the methods used or the common themes that have emerged.

The important thing to think about as you write your main body of text is to summarise the key takeaway messages from each research paper and how they come together to give one or more conclusions. Don’t just stop at summarising the papers though, instead continue on to give your analysis and your opinion on how these previous publications fit into the wider research field and where they have an impact. Emphasise the strengths of the studies you have evaluated also be clear on the limitations of previous work how these may have influenced the results and conclusions of the studies.

In your concluding paragraphs focus your discussion on how your critical evaluation of literature has helped you identify unanswered research questions and how you plan to address these in your PhD project. State the research problem you’re going to address and end with the overarching aim and key objectives of your work .

When writing at a graduate level, you have to take a critical approach when reading existing literature in your field to determine if and how it added value to existing knowledge. You may find that a large number of the papers on your reference list have the right academic context but are essentially saying the same thing. As a graduate student, you’ll need to take a methodological approach to work through this existing research to identify what is relevant literature and what is not.

You then need to go one step further to interpret and articulate the current state of what is known, based on existing theories, and where the research gaps are. It is these gaps in the literature that you will address in your own research project.

• Decide on a research area and an associated research question.
• Decide on the extent of your scope and start looking for literature.
• Review and evaluate the literature.
• Plan an outline for your literature review and start writing it.

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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).

Article   Google Scholar  

Ledesma, H. A. et al. Nature Nanotechnol. 14 , 645–657 (2019).

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Brahlek, M., Koirala, N., Bansal, N. & Oh, S. Solid State Commun. 215–216 , 54–62 (2015).

Choi, Y. & Lee, S. Y. Nature Rev. Chem . https://doi.org/10.1038/s41570-020-00221-w (2020).

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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.

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• How to Write a Literature Review | Guide, Examples, & Templates

How to Write a Literature Review | Guide, Examples, & Templates

Published on January 2, 2023 by Shona McCombes . Revised on September 11, 2023.

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 that you can later apply to your paper, thesis, or dissertation topic .

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 summarize sources—it analyzes, synthesizes , and critically evaluates to give a clear picture of the state of knowledge on the subject.

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Table of contents

What is the purpose of 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, free lecture slides, other interesting articles, frequently asked questions, introduction.

• Quick Run-through
• Step 1 & 2

When you write a thesis , dissertation , or research paper , you will likely 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 its scholarly context
• Develop a theoretical framework and methodology for your research
• Position your work in relation to other researchers and theorists
• Show how your research addresses a gap or contributes to a debate
• Evaluate the current state of research and demonstrate your knowledge of the scholarly debates around your topic.

Writing literature reviews is a particularly important skill if you want to apply for graduate school or pursue a career in research. 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 problem and questions .

Make a list of keywords

Start by creating a list of keywords related to your research question. 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 as 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 useful 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 also use boolean operators to help narrow down your search.

Make sure to 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.

You likely won’t be able to read absolutely everything that has been written on your topic, so it will be necessary to evaluate which sources are most relevant to your research question.

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?
• 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 use our template to summarize and evaluate sources you’re thinking about using. Click on either button below to download.

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 is important to keep track of your sources with citations to avoid plagiarism . It can be helpful to make an annotated bibliography , where you compile full citation 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.

To begin organizing your literature review’s argument and structure, be sure you 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 organizing the body of a literature review. 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 summarizing sources in order.

Try to analyze 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 organize 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.

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, you can follow these tips:

• 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 sentences to draw connections, comparisons and contrasts

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

When you’ve finished writing and revising your literature review, don’t forget to proofread thoroughly before submitting. Not a language expert? Check out Scribbr’s professional proofreading services !

This article has been adapted into lecture slides that you can use to teach your students about writing a literature review.

Scribbr slides are free to use, customize, and distribute for educational purposes.

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If you want to know more about the research process , methodology , research bias , or statistics , make sure to check out some of our other articles with explanations and examples.

• Sampling methods
• Simple random sampling
• Stratified sampling
• Cluster sampling
• Likert scales
• Reproducibility

 Statistics

• Null hypothesis
• Statistical power
• Probability distribution
• Effect size
• Poisson distribution

Research bias

• Optimism bias
• Cognitive bias
• Implicit bias
• Hawthorne effect
• Anchoring bias
• Explicit bias

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 thesis, dissertation , or research paper , in order to situate your work in relation to existing knowledge.

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

• To familiarize 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 thesis or dissertation . After the introduction , it grounds your research in a scholarly field and leads directly to your theoretical framework or methodology .

A literature review is a survey of credible sources on a topic, often used in dissertations , theses, and research papers . Literature reviews give an overview of knowledge on a subject, helping you identify relevant theories and methods, as well as gaps in existing research. Literature reviews are set up similarly to other  academic texts , with an introduction , a main body, and a conclusion .

An  annotated bibliography is a list of  source references that has a short description (called an annotation ) for each of the sources. It is often assigned as part of the research process for a  paper .  

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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: .

• 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: 
• How to write a literature review faster with Paperpal? 

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.

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

1. 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. 

2. 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.

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3. 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. 

4. 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. 

5. 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. 

6. 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: 

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. 

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. 

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. 

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. 

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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. 

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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. 

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How to write a literature review faster with Paperpal?  

Paperpal, an AI writing assistant, integrates powerful academic search capabilities within its writing platform. With the Research | Cite feature, you get 100% factual insights, with citations backed by 250M+ verified research articles, directly within your writing interface. It also allows you auto-cite references in 10,000+ styles and save relevant references in your Citation Library. By eliminating the need to switch tabs to find answers to all your research questions, Paperpal saves time and helps you stay focused on your writing.   

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• Review and Save: Paperpal summarizes the information, while citing sources and listing relevant reads. You can quickly scan the results to identify relevant references and save these directly to your built-in citations library for later access. 
• Cite with Confidence: Paperpal makes it easy to incorporate relevant citations and references in 10,000+ styles into your writing, ensuring your arguments are well-supported by credible sources. This translates to a polished, well-researched literature review. 

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 good literature review is an ongoing process, and it may be necessary to revisit and update it as your research progresses. By combining effortless research with an easy citation process, Paperpal Research streamlines the literature review process and empowers you to write faster and with more confidence. Try Paperpal Research now and see for yourself.  

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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Ten Simple Rules for Writing a Literature Review

Marco pautasso.

1 Centre for Functional and Evolutionary Ecology (CEFE), CNRS, Montpellier, France

2 Centre for Biodiversity Synthesis and Analysis (CESAB), FRB, Aix-en-Provence, France

Literature reviews are in great demand in most scientific fields. Their need stems from the ever-increasing output of scientific publications [1] . For example, compared to 1991, in 2008 three, eight, and forty times more papers were indexed in Web of Science on malaria, obesity, and biodiversity, respectively [2] . Given such mountains of papers, scientists cannot be expected to examine in detail every single new paper relevant to their interests [3] . Thus, it is both advantageous and necessary to rely on regular summaries of the recent literature. Although recognition for scientists mainly comes from primary research, timely literature reviews can lead to new synthetic insights and are often widely read [4] . For such summaries to be useful, however, they need to be compiled in a professional way [5] .

When starting from scratch, reviewing the literature can require a titanic amount of work. That is why researchers who have spent their career working on a certain research issue are in a perfect position to review that literature. Some graduate schools are now offering courses in reviewing the literature, given that most research students start their project by producing an overview of what has already been done on their research issue [6] . However, it is likely that most scientists have not thought in detail about how to approach and carry out a literature review.

Reviewing the literature requires the ability to juggle multiple tasks, from finding and evaluating relevant material to synthesising information from various sources, from critical thinking to paraphrasing, evaluating, and citation skills [7] . In this contribution, I share ten simple rules I learned working on about 25 literature reviews as a PhD and postdoctoral student. Ideas and insights also come from discussions with coauthors and colleagues, as well as feedback from reviewers and editors.

Rule 1: Define a Topic and Audience

How to choose which topic to review? There are so many issues in contemporary science that you could spend a lifetime of attending conferences and reading the literature just pondering what to review. On the one hand, if you take several years to choose, several other people may have had the same idea in the meantime. On the other hand, only a well-considered topic is likely to lead to a brilliant literature review [8] . The topic must at least be:

• interesting to you (ideally, you should have come across a series of recent papers related to your line of work that call for a critical summary),
• an important aspect of the field (so that many readers will be interested in the review and there will be enough material to write it), and
• a well-defined issue (otherwise you could potentially include thousands of publications, which would make the review unhelpful).

Ideas for potential reviews may come from papers providing lists of key research questions to be answered [9] , but also from serendipitous moments during desultory reading and discussions. In addition to choosing your topic, you should also select a target audience. In many cases, the topic (e.g., web services in computational biology) will automatically define an audience (e.g., computational biologists), but that same topic may also be of interest to neighbouring fields (e.g., computer science, biology, etc.).

Rule 2: Search and Re-search the Literature

After having chosen your topic and audience, start by checking the literature and downloading relevant papers. Five pieces of advice here:

• keep track of the search items you use (so that your search can be replicated [10] ),
• keep a list of papers whose pdfs you cannot access immediately (so as to retrieve them later with alternative strategies),
• use a paper management system (e.g., Mendeley, Papers, Qiqqa, Sente),
• define early in the process some criteria for exclusion of irrelevant papers (these criteria can then be described in the review to help define its scope), and
• do not just look for research papers in the area you wish to review, but also seek previous reviews.

The chances are high that someone will already have published a literature review ( Figure 1 ), if not exactly on the issue you are planning to tackle, at least on a related topic. If there are already a few or several reviews of the literature on your issue, my advice is not to give up, but to carry on with your own literature review,

The bottom-right situation (many literature reviews but few research papers) is not just a theoretical situation; it applies, for example, to the study of the impacts of climate change on plant diseases, where there appear to be more literature reviews than research studies [33] .

• discussing in your review the approaches, limitations, and conclusions of past reviews,
• trying to find a new angle that has not been covered adequately in the previous reviews, and
• incorporating new material that has inevitably accumulated since their appearance.

When searching the literature for pertinent papers and reviews, the usual rules apply:

• be thorough,
• use different keywords and database sources (e.g., DBLP, Google Scholar, ISI Proceedings, JSTOR Search, Medline, Scopus, Web of Science), and
• look at who has cited past relevant papers and book chapters.

Rule 3: Take Notes While Reading

If you read the papers first, and only afterwards start writing the review, you will need a very good memory to remember who wrote what, and what your impressions and associations were while reading each single paper. My advice is, while reading, to start writing down interesting pieces of information, insights about how to organize the review, and thoughts on what to write. This way, by the time you have read the literature you selected, you will already have a rough draft of the review.

Of course, this draft will still need much rewriting, restructuring, and rethinking to obtain a text with a coherent argument [11] , but you will have avoided the danger posed by staring at a blank document. Be careful when taking notes to use quotation marks if you are provisionally copying verbatim from the literature. It is advisable then to reformulate such quotes with your own words in the final draft. It is important to be careful in noting the references already at this stage, so as to avoid misattributions. Using referencing software from the very beginning of your endeavour will save you time.

Rule 4: Choose the Type of Review You Wish to Write

After having taken notes while reading the literature, you will have a rough idea of the amount of material available for the review. This is probably a good time to decide whether to go for a mini- or a full review. Some journals are now favouring the publication of rather short reviews focusing on the last few years, with a limit on the number of words and citations. A mini-review is not necessarily a minor review: it may well attract more attention from busy readers, although it will inevitably simplify some issues and leave out some relevant material due to space limitations. A full review will have the advantage of more freedom to cover in detail the complexities of a particular scientific development, but may then be left in the pile of the very important papers “to be read” by readers with little time to spare for major monographs.

There is probably a continuum between mini- and full reviews. The same point applies to the dichotomy of descriptive vs. integrative reviews. While descriptive reviews focus on the methodology, findings, and interpretation of each reviewed study, integrative reviews attempt to find common ideas and concepts from the reviewed material [12] . A similar distinction exists between narrative and systematic reviews: while narrative reviews are qualitative, systematic reviews attempt to test a hypothesis based on the published evidence, which is gathered using a predefined protocol to reduce bias [13] , [14] . When systematic reviews analyse quantitative results in a quantitative way, they become meta-analyses. The choice between different review types will have to be made on a case-by-case basis, depending not just on the nature of the material found and the preferences of the target journal(s), but also on the time available to write the review and the number of coauthors [15] .

Rule 5: Keep the Review Focused, but Make It of Broad Interest

Whether your plan is to write a mini- or a full review, it is good advice to keep it focused 16 , 17 . Including material just for the sake of it can easily lead to reviews that are trying to do too many things at once. The need to keep a review focused can be problematic for interdisciplinary reviews, where the aim is to bridge the gap between fields [18] . If you are writing a review on, for example, how epidemiological approaches are used in modelling the spread of ideas, you may be inclined to include material from both parent fields, epidemiology and the study of cultural diffusion. This may be necessary to some extent, but in this case a focused review would only deal in detail with those studies at the interface between epidemiology and the spread of ideas.

While focus is an important feature of a successful review, this requirement has to be balanced with the need to make the review relevant to a broad audience. This square may be circled by discussing the wider implications of the reviewed topic for other disciplines.

Rule 6: Be Critical and Consistent

Reviewing the literature is not stamp collecting. A good review does not just summarize the literature, but discusses it critically, identifies methodological problems, and points out research gaps [19] . After having read a review of the literature, a reader should have a rough idea of:

• the major achievements in the reviewed field,
• the main areas of debate, and
• the outstanding research questions.

It is challenging to achieve a successful review on all these fronts. A solution can be to involve a set of complementary coauthors: some people are excellent at mapping what has been achieved, some others are very good at identifying dark clouds on the horizon, and some have instead a knack at predicting where solutions are going to come from. If your journal club has exactly this sort of team, then you should definitely write a review of the literature! In addition to critical thinking, a literature review needs consistency, for example in the choice of passive vs. active voice and present vs. past tense.

Rule 7: Find a Logical Structure

Like a well-baked cake, a good review has a number of telling features: it is worth the reader's time, timely, systematic, well written, focused, and critical. It also needs a good structure. With reviews, the usual subdivision of research papers into introduction, methods, results, and discussion does not work or is rarely used. However, a general introduction of the context and, toward the end, a recapitulation of the main points covered and take-home messages make sense also in the case of reviews. For systematic reviews, there is a trend towards including information about how the literature was searched (database, keywords, time limits) [20] .

How can you organize the flow of the main body of the review so that the reader will be drawn into and guided through it? It is generally helpful to draw a conceptual scheme of the review, e.g., with mind-mapping techniques. Such diagrams can help recognize a logical way to order and link the various sections of a review [21] . This is the case not just at the writing stage, but also for readers if the diagram is included in the review as a figure. A careful selection of diagrams and figures relevant to the reviewed topic can be very helpful to structure the text too [22] .

Rule 8: Make Use of Feedback

Reviews of the literature are normally peer-reviewed in the same way as research papers, and rightly so [23] . As a rule, incorporating feedback from reviewers greatly helps improve a review draft. Having read the review with a fresh mind, reviewers may spot inaccuracies, inconsistencies, and ambiguities that had not been noticed by the writers due to rereading the typescript too many times. It is however advisable to reread the draft one more time before submission, as a last-minute correction of typos, leaps, and muddled sentences may enable the reviewers to focus on providing advice on the content rather than the form.

Feedback is vital to writing a good review, and should be sought from a variety of colleagues, so as to obtain a diversity of views on the draft. This may lead in some cases to conflicting views on the merits of the paper, and on how to improve it, but such a situation is better than the absence of feedback. A diversity of feedback perspectives on a literature review can help identify where the consensus view stands in the landscape of the current scientific understanding of an issue [24] .

Rule 9: Include Your Own Relevant Research, but Be Objective

In many cases, reviewers of the literature will have published studies relevant to the review they are writing. This could create a conflict of interest: how can reviewers report objectively on their own work [25] ? Some scientists may be overly enthusiastic about what they have published, and thus risk giving too much importance to their own findings in the review. However, bias could also occur in the other direction: some scientists may be unduly dismissive of their own achievements, so that they will tend to downplay their contribution (if any) to a field when reviewing it.

In general, a review of the literature should neither be a public relations brochure nor an exercise in competitive self-denial. If a reviewer is up to the job of producing a well-organized and methodical review, which flows well and provides a service to the readership, then it should be possible to be objective in reviewing one's own relevant findings. In reviews written by multiple authors, this may be achieved by assigning the review of the results of a coauthor to different coauthors.

Rule 10: Be Up-to-Date, but Do Not Forget Older Studies

Given the progressive acceleration in the publication of scientific papers, today's reviews of the literature need awareness not just of the overall direction and achievements of a field of inquiry, but also of the latest studies, so as not to become out-of-date before they have been published. Ideally, a literature review should not identify as a major research gap an issue that has just been addressed in a series of papers in press (the same applies, of course, to older, overlooked studies (“sleeping beauties” [26] )). This implies that literature reviewers would do well to keep an eye on electronic lists of papers in press, given that it can take months before these appear in scientific databases. Some reviews declare that they have scanned the literature up to a certain point in time, but given that peer review can be a rather lengthy process, a full search for newly appeared literature at the revision stage may be worthwhile. Assessing the contribution of papers that have just appeared is particularly challenging, because there is little perspective with which to gauge their significance and impact on further research and society.

Inevitably, new papers on the reviewed topic (including independently written literature reviews) will appear from all quarters after the review has been published, so that there may soon be the need for an updated review. But this is the nature of science [27] – [32] . I wish everybody good luck with writing a review of the literature.

Acknowledgments

Many thanks to M. Barbosa, K. Dehnen-Schmutz, T. Döring, D. Fontaneto, M. Garbelotto, O. Holdenrieder, M. Jeger, D. Lonsdale, A. MacLeod, P. Mills, M. Moslonka-Lefebvre, G. Stancanelli, P. Weisberg, and X. Xu for insights and discussions, and to P. Bourne, T. Matoni, and D. Smith for helpful comments on a previous draft.

Funding Statement

This work was funded by the French Foundation for Research on Biodiversity (FRB) through its Centre for Synthesis and Analysis of Biodiversity data (CESAB), as part of the NETSEED research project. The funders had no role in the preparation of the manuscript.

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How to write a good PhD literature review?

I am in the early stages of my PhD and I am trying to put together a literature review of my topic. My intention is that this review will eventually be included in my thesis, something like " the chapter that describes the state of the art in the domain ."

My subject is soft matter physics and a large number of theses have already been written this topic. When looking at the literature reviews included in these other works I've noticed that:

• The sequence of ideas is often the same (this makes sense, so why not?)
• Cited papers are always the same, even though 20 years elapsed between the first and last thesis. Moreover, papers from the 30's are cited but no one in my lab seems to have a copy available?

My hypothesis is that these theses are derived from some sort of a Mother of All Thesis , and that paraphrasing the work of the previous student is OK.

So, what makes a good literature review?

How do you notice that a literature review is sloppy?

PS: I posted this question because I assume many of you have experience with this process either in your own PhD work, or as a supervisor where you have had to deal with paraphrasing of your students.

PS2: I am not asking about making proper citations, LaTeX+BibTeX handles that like a charm.

• literature-review

• I am not sure if your question fits here, if I remove the term "soft matter physics" this can be applied to any thesis in the natural sciences. In general I would recommend against a "review thesis" and keep this section rather short. You should cite only the relevant literature for your scientific argument, not what the whole field generated over the last decades. –  Alexander Commented Oct 12, 2013 at 12:16
• It's a very good point but I think writing a good literature review is specific to a given domain... I fear that good practices in social science or biology may not apply to physics, but I may be wrong on that point. –  Pascail Commented Oct 12, 2013 at 12:22
• The relevance of such a section is a very good starting point, I like the idea of citing only literature relevant to the scientific discussion that comes after the results. Won't it sound too superficial, like "Well you're talking about elasticity but you don't even cite Landau's work ?" –  Pascail Commented Oct 12, 2013 at 12:29

4 Answers 4

The purpose and expectations of a PhD literature review is likely to vary from field to field. My PhD was in Physics, but my views might be taken to apply generally.

There is likely to be some repetition or paraphrasing between students in the same research group, when it comes to the literature review. However, perhaps the comments below might help.

A literature review should be an enjoyable to read (!) introduction, survey and guide to the state of the art. You want to introduce your reader to the field (assuming a clever, but non-expert reader), setting out what has gone before, and perhaps to some extent showing where the gaps are in the research - raising the opportunity for you to present your research as that which fills a gap (Next chapter: "Aims and Objectives", or similar).

My primary hallmarks of a poor, or sloppy literature review is that papers are listed without any helpful context . A dreary literature review, to me, is a listing of papers that we all already know about, without any guide to the reader why the trail leads me to hold the present thesis. No-one much likes reading a dry chronology of papers. I personally, want to be told the story of the research and the literature review plays an important part of that story.

The opportunity exists here to review the field - what are the general trends in the literature? For example, Paper A was the first to introduce the theory that drove the authors of Paper B to perform experiment Z which is now the standard technique. However, Paper C suggests that an alternative method may be more effective, etc.

Note that your review shouldn't attempt to be a complete review of the field - whole standalone papers are written on this, usually by invitation. Your PhD literature review should be more focused, but still a recounting of the Story So Far.

Since your literature review is to be a nice, focused review of the path to your contribution, it is likely that you will read far more papers than you will need to cite in your literature review. Those papers that do not contribute to the Story So Far can be excluded from your literature review. Going off on a tangent, like in any story, can lose and confuse your readers. If you feel a need to refer to these papers, perhaps you can refer to a decent review article which discusses them in detail, for the interested reader.

I think Nikolas' answer is already pretty great. I'm not doing physics, but I'll try and stay as general as I can. Here's some specific advice I got from my supervisor and things I realized while doing my own lit review:

• It is normal for a big section of referenced papers to be the same across a lot of survey / literature review papers. Those would be the papers that first introduced a problem, a concept, an approach.

In addition to the seminal papers from your (sub)field, you usually want to describe the current state-of-the art . This would be based on current papers based on the original problem, concept or approach that adopt the problem for a different environment, apply a concept for a different purpose or represent an improvement to the approach.

For example, in Computer Science, it would be okay to talk about a structure or a problem ( seminal paper ) and then talk about the current best algorithm(s) to solving the problem ( state-of-the-art ) without mentioning every single "evolution step" of the algorithm.

Basically, to sum up and dump up these two points: you cite the "first" and the "last" paper dealing with the same thing. Of course, there's exceptions to this: if there's any groundbreaking papers between the "first" and the "last" paper, sometimes intermediate papers can also be viewed as "seminal papers" for the subject/field.

This might depend slightly on the type of document you want to produce, but usually it is okay for you to explain the technique / method in detail, while for practical uses of the technique, you just mention (and cite) several successful applications of the technique without going in to detail about how exactly the method was adopted.

Finally, if your goal is to publish your literature review as a survey paper (which is usually worth a shot), you should think about how to "get a new spin on things".

Every paper, including survey papers, is supposed to be a scientific contribution. That means that you have to find something that makes your survey useful , or in some context better, then all the existing surveys. This might be a change of context in which the methods are examined, it might cover more material, offer new classifications of the methods or new links between them.

I would say you have to think of at least one type of reader (a reader with one type of goal) who will take your review and say: "That's it!" , while he can not say that any of the current surveys out there are exactly "it" for him.

References and bibliography are to be read and digested in a progressive manner. References that might have been not so intuitive become useful over time as we gain more experience. One needs to document them in any suitable way and:

• Add new references and connections with current work.
• Track these references and revisit them when and where you touch base again with them.
• Revise the entry with new information or clearer understanding of the subject.
• Remove any parasite or related paper that you think is no more directly related to your work - clear clutter up - this is important to stop accumulating lots of bibliography which can become non specific!
• All of the references you might accumulate may not be useful for the final bibiliography. There is need to sort or classify these references as biblio, self learning references, state of art, related (first order, second order) and so on and so forth.

Doing this using a wiki would be advisable - and if there is a team involved group updates would be preferable! Basically one needs a good sense of organization while writing the thesis.

• Sorting the refs into specific usage is a great help ! –  Pascail Commented Feb 4, 2014 at 11:18
• 1 While it is all great advice, somewhat similarly to Vaidyanathan's answer , I feel like it's more focused on how to organize the bibliography during one's PhD and not how to do a lit review. It does mention using this for the final bibliography , but I would say putting this in the more specific context of the question would make for a much better answer. –  penelope Commented Feb 4, 2014 at 13:05

There are couple of points i like to make from my perspective.

Bibliography is something which evolves during your PhD. I would recommend not to write it at the first place. As you read more and more, relevant to your area in Soft matter, you can keep adding it to your bibliography

Soft matter is a really huge area. One who works on Molecular dynamics may not even touch crystal defects while writing his bibliography. In that way it is really topic specific and not the entire area.

You said, you saw some say 30 papers in every thesis. This is not because of magic, this is only because they are path breaking. If you are in MD area (which is mine), and you are using a thermostat, it is 99.9999 % sure that you cite Nose-Hoover paper. It is no magic.

There is no point in saying none from my lab is cited. It depends on how many groups are working in that "specific" area and what impact had the papers published from your lab made in their research.

This all points out to the fact that one does not simply write a bibliography of an entire area :)

• I'm sorry for the downvote but I do not feel like this answers the right question at all. It is all useful advice, just not the answer to "How do I write a lit review?" but rather "How do I organize/keep my bibliography collection?" . –  penelope Commented Feb 4, 2014 at 12:59

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Literature Review: Conducting & Writing

• Sample Literature Reviews
• Steps for Conducting a Lit Review
• Finding "The Literature"
• Organizing/Writing
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Sample Lit Reviews from Communication Arts

Have an exemplary literature review.

Note: These are sample literature reviews from a class that were given to us by an instructor when APA 6th edition was still in effect. These were excellent papers from her class, but it does not mean they are perfect or contain no errors. Thanks to the students who let us post!

• Literature Review Sample 1
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• Literature Review Sample 3

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Please contact Britt McGowan at [email protected] for inclusion in this guide. All disciplines welcome and encouraged.

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• The First 6 Months - Tackling the Literature Review

For most PhD students, the first year is dominated by writing a literature review . For anyone yet to meet this particular beast, a literature review is a summary of all the key research completed in your field, highlighting gaps in understanding that future studies need to address. This is commonly completed in your first year to build your knowledge of the subject and identify questions which your research could aim to answer. Your literature review also forms part of your confirmation report, which you need to complete at the end of your first year to be confirmed as a doctoral candidate. This will be a really rewarding document to look back on at the end of the PhD to see how your research has contributed to the field. However, knowing where to start can be daunting so here are my top tips to help.

#1 Decide on your review style early on

Your literature review can be systematic or narrative. A narrative review is the way most people think to approach a literature review: you start with a few key words and then grow your search organically by following the citations of key papers. You can keep changing your search words to find more articles and can decide which papers you want to use with minimal justification. The alternative is a systematic review. As the name suggests this style has a stricter system with defined search terms and exclusion/inclusion criteria. This helps you find all the possible articles which you then narrow down the ones to review using detailed criteria. Which style of review is appropriate will depend on your topic and research question. Talk to your supervisor about which type of review you are aiming for.

#2 Find an organisation method that works for you

The key challenge with the literature review is managing the sheer volume of papers you read. As I have advised before, write EVERYTHING down. You will never remember exactly what you read or where you found it. A sure sign of a PhD student is that we have a billion tabs open – all papers that we intend to read at some point but will probably never get round to! This means that the icon for each tab is so small that even keeping the article open isn’t a sure-fire way to find it again! Deciding on a notetaking system that works for you is really important; the earlier into your reading journey you do this, the easier it will be. I personally use a spreadsheet with the article name, first author, year, key words (which I can use to filter for relevant paragraphs when writing) and key notes about the paper. This system also means I can check that I haven’t read a paper before (trust me, it happens!!). People record their notes differently - my trusty spreadsheet might not work for you. Find what suits you and then stick to it. It's also important to decide on a reference management system early on so you can add your articles in as your read them and keep an accurate bibliography. This will make it easier when you need to import citations into your literature review and means you can make your reference list automatically through systems like EndNote or Mendeley.

#3 Know when to start writing

Obviously, you can’t start writing straight away – you have to read the literature to be able to review it! However, it’s hard to know when to stop reading and put pen to paper. This is a personal decision, but I started writing as soon as I felt I had a good understanding of a mini topic. I divided my literature review into key sections and then researched and wrote a draft for each in turn. This broke up the tasks into smaller chunks and made it feel more achievable. Starting writing can also show you areas where you’re missing references to support your point. This creates a feedback cycle of more reading and more writing to strength your review.

Start writing whichever section you feel most confident in. This doesn’t have to be the first section. My background is in Biomedical Sciences so I was more confident on those sections than the topics which were newer to me. Writing these paragraphs first helped me build confidence and develop my writing style. Send this first section to your supervisors so they can get a feel for your writing voice early on. The first time you send your work off is really daunting but remember they are there to help and support you, not assess you. Their feedback will help grow your literature review to the standard of your future thesis.

#4 Keep updating and refreshing articles

The nature of literature is that it keeps growing. This means you can’t do one search and assume that 6 months later you still have all the relevant articles. New research is being published every day so make sure to keep checking for any key developments. The library team at your university may be able to help you set up alerts for key words so that you never miss a crucial paper. If there are a few key players in your area, follow them on social media so you’ll see if they publish anything new. Accepting that you will miss papers the first-time round is all part of the process of reviewing and it can be exciting to see how the field has changed in the 6 months since you last checked results.

#5 Trust that you are the right person to write the review

I felt very strange about summarising (and sometimes criticising) the work of established researchers. However, over the course of writing your literature review you will start to better understand the field and be able to critically analyse the work that has gone before you. Imposter syndrome has a huge effect on review authors but trust that you are the right person to write this review and by the end you’ll know enough to summarise the work completed. All PhD students struggle with this feeling so talk to other researchers; there may also be some university provided courses on imposter syndrome to help you see your abilities more clearly.

Doing my literature review in the last six months has increased my confidence when discussing my project with others. Taking the time to do your review well will stand you in better stead when you start collecting research presenting results. Plus, it’s satisfying to see all the progress you’ve made when you look at your 10,000-word document. You can do it!!

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How to write a literature review for a dissertation, published by steve tippins on july 5, 2019 july 5, 2019.

Last Updated on: 22nd May 2024, 04:06 am

Chapter 2 of your dissertation, your literature review, may be the longest chapter. It is not uncommon to see lit reviews in the 40- to 60-page range. That may seem daunting, but I contend that the literature review could be the easiest part of your dissertation.

It is also foundational. To be able to select an appropriate research topic and craft expert research questions, you’ll need to know what has already been discovered and what mysteries remain. 

Remember, your degree is meant to indicate your achieving the highest level of expertise in your area of study. The lit review for your dissertation could very well form the foundation for your entire career.

In this article, I’ll give you detailed instructions for how to write the literature review of your dissertation without stress. I’ll also provide a sample outline.

When to Write the Literature Review for your Dissertation

Though technically Chapter 2 of your dissertation, many students write their literature review first. Why? Because having a solid foundation in the research informs the way you write Chapter 1.

Also, when writing Chapter 1, you’ll need to become familiar with the literature anyway. It only makes sense to write down what you learn to form the start of your lit review.

Some institutions even encourage students to write Chapter 2 first. But it’s important to talk with your Chair to see what he or she recommends.

How Long Should a Literature Review Be?

There is no set length for a literature review. The length largely depends on your area of study. However, I have found that most literature reviews are between 40-60 pages.

If your literature review is significantly shorter than that, ask yourself (a) if there is other relevant research that you have not explored, or (b) if you have provided enough of a discussion about the information you did explore.

Preparing to Write the Literature Review for your Dissertation

Step 1. Search Using Key Terms

Most people start their lit review searching appropriate databases using key terms. For example, if you’re researching the impact of social media on adult learning, some key terms you would use at the start of your search would be adult learning, androgogy, social media, and “learning and social media” together. 

If your topic was the impact of natural disasters on stock prices, then you would need to explore all types of natural disasters, other market factors that impact stock prices, and the methodologies used. 

You can save time by skimming the abstracts first; if the article is not what you thought it might be you can move on quickly.

Once you start finding articles using key terms, two different things will usually happen: you will find new key terms to search, and the articles will lead you directly to other articles related to what you are studying. It becomes like a snowball rolling downhill. 

Note that the vast majority of your sources should be articles from peer-reviewed journals. 

Step 2. Immerse Yourself in the Literature

When people ask what they should do first for their dissertation the most common answer is “immerse yourself in the literature.” What exactly does this mean?

Think of this stage as a trip into the quiet heart of the forest. Your questions are at the center of this journey, and you’ll need to help your reader understand which trees — which particular theories, studies, and lines of reasoning — got you there. 

There are lots of trees in this particular forest, but there are particular trees that mark your path.  What makes them unique? What about J’s methodology made you choose that study over Y’s? How did B’s argument triumph over A’s, thus leading you to C’s theory? 

You are showing your reader that you’ve fully explored the forest of your topic and chosen this particular path, leading to these particular questions (your research questions), for these particular reasons.

Step 3. Consider Gaps in the Research

The gaps in the research are where current knowledge ends and your study begins. In order to build a case for doing your study, you must demonstrate that it:

• Is worthy of doctoral-level research, and
• Has not already been studied

Defining the gaps in the literature should help accomplish both aims. Identifying studies on related topics helps make the case that your study is relevant, since other researchers have conducted related studies.

And showing where they fall short will help make the case that your study is the appropriate next step. Pay special attention to the recommendations for further research that the authors of studies make.

Step 4. Organize What You Find

As you find articles, you will have to come up with methods to organize what you find. 

Whether you find a computer-based system (three popular systems are Zotero, endNote, and Mendeley) or some sort of manual system such as index cards, you need to devise a method where you can easily group your references by subject and methodology and find what you are looking for when you need it. It is very frustrating to know you have found an article that supports a point that you are trying to make, but you can’t find the article!

One way to save time and keep things organized is to cut and paste relevant quotations (and their references) under topic headings. You’ll be able to rearrange and do some paraphrasing later, but if you’ve got the quotations and the citations that are important to you already embedded in your text, you’ll have an easier time of it.  

If you choose this method, be sure to list the whole reference on the reference/bibliography page so you don’t have to do this page separately later. Some students use Scrivener for this purpose, as it offers a clear way to view and easily navigate to all sections of a written document.

Need help with your literature review? Take a look at my dissertation coaching and dissertation editing services.

How to Write the Literature Review for your Dissertation

Once you have gathered a sufficient number of pertinent references, you’ll need to string them together in a way that tells your story. Explain what previous researchers have done by telling the story of how knowledge on this topic has evolved. Here, you are laying the support for your topic and showing that your research questions need to be answered. Let’s dive into how to actually write your dissertation’s literature review.

Step 1. Create an Outline

If you’ve created a system for keeping track of the sources you’ve found, you likely already have the bones of an outline. Even if not, it may be relatively easy to see how to organize it all. The main thing to remember is, keep it simple and don’t overthink it. There are several ways to organize your dissertation’s literature review, and I’ll discuss some of the most common below:

• By topic. This is by far the most common approach, and it’s the one I recommend unless there’s a clear reason to do otherwise. Topics are things like servant leadership, transformational leadership, employee retention, organizational knowledge, etc. Organizing by topic is fairly simple and it makes sense to the reader.
• Chronologically. In some cases, it makes sense to tell the story of how knowledge and thought on a given subject have evolved. In this case, sub-sections may indicate important advances or contributions. 
• By methodology. Some students organize their literature review by the methodology of the studies. This makes sense when conducting a mixed-methods study, and in cases where methodology is at the forefront.

Step 2. Write the Paragraphs 

I said earlier that I thought the lit review was the easiest part to write, and here is why. When you write about the findings of others, you can do it in small, discrete time periods. You go down the path awhile, then you rest. 

Once you have many small pieces written, you can then piece them together. You can write each piece without worrying about the flow of the chapter; that can all be done at the end when you put the jigsaw puzzle of references together.

Step 3. Analyze

The literature review is a demonstration of your ability to think critically about existing research and build meaningfully on it in your study. Avoid simply stating what other researchers said. Find the relationships between studies, note where researchers agree and disagree, and– especiallyy–relate it to your own study. 

Pay special attention to controversial issues, and don’t be afraid to give space to researchers who you disagree with. Including differing opinions will only strengthen the credibility of your study, as it demonstrates that you’re willing to consider all sides.

Step 4. Justify the Methodology

In addition to discussing studies related to your topic, include some background on the methodology you will be using. This is especially important if you are using a new or little-used methodology, as it may help get committee members onboard. 

I have seen several students get slowed down in the process trying to get committees to buy into the planned methodology. Providing references and samples of where the planned methodology has been used makes the job of the committee easier, and it will also help your reader trust the outcomes.

Advice for Writing Your Dissertation’s Literature Review

• Remember to relate each section back to your study (your Problem and Purpose statements).
• Discuss conflicting findings or theoretical positions. Avoid the temptation to only include research that you agree with.
• Sections should flow together, the way sections of a chapter in a nonfiction book do. They should relate to each other and relate back to the purpose of your study. Avoid making each section an island.
• Discuss how each study or theory relates to the others in that section.
• Avoid relying on direct quotes–you should demonstrate that you understand the study and can describe it accurately.

Sample Outline of a Literature Review (Dissertation Chapter 2)

Here is a sample outline, with some brief instructions. Note that your institution probably has specific requirements for the structure of your dissertation’s literature review. But to give you a general idea, I’ve provided a sample outline of a dissertation ’s literature review here.

• Introduction
• State the problem and the purpose of the study
• Give a brief synopsis of literature that establishes the relevance of the problem
• Very briefly summarize the major sections of your chapter

Documentation of Literature Search Strategy

• Include the library databases and search engines you used
• List the key terms you used
• Describe the scope (qualitative) or iterative process (quantitative). Explain why and based on what criteria you selected the articles you did.

Literature Review (this is the meat of the chapter)

• Sub-topic a
• Sub-topic b
• Sub-topic c

See below for an example of what this outline might look like.

How to Write a Literature Review for a Dissertation: An Example 

Let’s take an example that will make the organization, and the outline, a little bit more clear. Below, I’ll fill out the example outline based on the topics discussed.

If your questions have to do with the impact of the servant leadership style of management on employee retention, you may want to saunter down the path of servant leadership first, learning of its origins , its principles , its values , and its methods . 

You’ll note the different ways the style is employed based on different practitioners’ perspectives or circumstances and how studies have evaluated these differences. Researchers will draw conclusions that you’ll want to note, and these conclusions will lead you to your next questions. 

Next, you’ll want to wander into the territory of management styles to discover their impact on employee retention in general. Does management style really make a difference in employee retention, and if so, what factors, exactly, make this impact?

Employee retention is its own path, and you’ll discover factors, internal and external, that encourage people to stick with their jobs.

You’ll likely find paradoxes and contradictions in here that just bring up more questions. How do internal and external factors mix and match? How can employers influence both psychology and context ? Is it of benefit to try and do so?

At first, these three paths seem somewhat remote from one another, but your interest is where the three converge. Taking the lit review section by section like this before tying it all together will not only make it more manageable to write but will help you lead your reader down the same path you traveled, thereby increasing clarity. 

Example Outline

So the main sections of your literature review might look something like this:

• Literature Search Strategy
• Conceptual Framework or Theoretical Foundation
• Literature that supports your methodology
• Origins, principles, values
• Seminal research
• Current research
• Management Styles’ Impact on employee retention
• Internal Factors
• External Factors
• Influencing psychology and context
• Summary and Conclusion

Final Thoughts on Writing Your Dissertation’s Chapter 2

The lit review provides the foundation for your study and perhaps for your career. Spend time reading and getting lost in the literature. The “aha” moments will come where you see how everything fits together. 

At that point, it will just be a matter of clearly recording and tracing your path, keeping your references organized, and conveying clearly how your research questions are a natural evolution of previous work that has been done.

PS. If you’re struggling with your literature review, I can help. I offer dissertation coaching and editing services.

Steve Tippins

Steve Tippins, PhD, has thrived in academia for over thirty years. He continues to love teaching in addition to coaching recent PhD graduates as well as students writing their dissertations. Learn more about his dissertation coaching and career coaching services. Book a Free Consultation with Steve Tippins

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Drowning in a sea of authors – How to be critical in a PhD literature review.

Feb 10, 2019

One of the problems I see often when I proofread PhDs is people being too descriptive and not being critical enough. This is most often the case in the literature review.

Critical thinking is one of the hardest skills to master in the entire PhD. Yet, it’s frustrating that many supervisors and doctoral training programs assume that PhD students are already capable critical thinkers.

To be critical in your PhD literature review doesn’t just mean describing what others have written. Instead, it means evaluating and analysing what it is that is being said.

Easy, right?

In this post we explain how to master the art of being critical in your literature review. If you haven’t already, check out our post on how to conduct a literature review.

We’ve also made an infographic. Simply click on the image below to download it.

So many questions…

When we say ‘you must be critical’, we mean that you must critically evaluate whatever it is you are discussing. Your job when critically evaluating is to think analytically, rather than descriptively.

However, being critical doesn’t mean criticising. Instead it means evaluating.

We saw in our post on how to write a literature review and in the PhD Writing Template that the literature review serves three purposes.

• To provide sufficient background information so that your own research problem can be contextualised
• To discuss how, how well, or even if, others have solved similar problems
• To outline the methods used by others when discussing similar problems

It is the first and second purposes that require critical thinking skills, because you want to be evaluating each work you read and act as an investigator.

A quick and easy way to do so is to ask five standard questions of each thing you read:

1. Who? 2. Where? 3. What? 4. When? 5. Why?

Asking these questions means we don’t just take what is written at face value. Instead, we evaluate, interpret, explain, analyse and comment on the text. These questions are a starting point for you to do that.

You’ll need to expand on these questions in order to go into more depth. You can do this by asking (you’ll find these questions in your PhD Writing Template ):

• Who wrote this and why?
• What are the authors trying to say?
• On what basis are they forming their judgements and arguments?
• Are they convincing?
• What theories or perspectives have been used? What alternative ones may have been used instead?
• What perspective are they coming from? What research tradition? What methods do they use? Are they appropriate?
• How does this work relate to others in the field?
• What are others arguing about the same topic?
• How does it relate to your research question or problem?

Ultimately, you’re asking: so what?

Don’t drown in a sea of authors

Let’s take an example of what not to do. Consider the following paragraph, from my very own PhD, on a theory of environmental politics known as ecological modernisation (that’s what the EM stands for):

We can see that I’ve become lost in the literature. All I’m really doing is listing various different studies. I’ve failed to think analytically and instead I’m just thinking descriptively.

I’m drowning in authors, navigating complex ideas and theories with little care for critically thinking about each of them. Instead I am piling up layers of ‘this person said this’ in order to showcase the field.

I – the academic – do not appear in this text at all. I offer no insight into my own critical reflection on any of the concepts, authors or ideas that I have listed. I have become invisible. I have not used the literature to put forward my own argument about the state of the discipline or to make the case for my own study.

There are two things to take from this:

• You need to speak with authority. Avoid falling into the trap of ‘he said, she said’, simply listing scholars and becoming invisible in the process.
• Avoid being overwhelmed by the literature.

How could I have improved my own literature review, using what I know now after years of working as an academic, proofreader and a literature review writer?

Consider the following excerpt from a literature review a colleague and I wrote as part of a journal article we had published . Notice how we aren’t invisible in a sea of authors and a sea of ‘he said, she said’.

Instead, we offer our own voice and put forward our own analysis of the literature. The sentence, ’this article argues, however, that all institutional formations are characterised by a combination or formal rules…’ is just one example of this.

Read, read, read, then write, write, write

Counterintuitively, when you are reading something for the first time, you should do so uncritically. Get a sense of what the writer is trying to do and whether the problem that they are tackling is in itself interesting.

We’ve written a guide about how to find content for your literature review. Check it out here .

You want to understand at this stage the ‘how’ and the ‘what’.

Once you have read the chapter, article, or book, and once you have a good sense of what it is about, you can then ask the when, why and how.

You can begin to unpack whether the conclusions are valid, whether the methods are appropriate, whether alternative theories or concepts could have been applied, and so on.

It is also at this stage that you can judge the validity of the paper as a whole. You need to ask yourself:

• Is it an incremental increase in the knowledge in your field, or is it game-changing?
• Is it a classic, or does it just add a little to what we knew before?

The answer to these questions can impact the significance the article or book plays in your literature review when you come to write.

As you write, you are forced to tackle what might seem like a wide range of literature. You are forced to relate different articles and books to one another and to explain the who, where, what, when and why.

But, you need a filter; much of what you read won’t be relevant to the study you are trying to develop or may be of poor quality.

It is these five questions above that act as your filter and which serve as your guide, against which you relate one piece of literature with another.

Master your lit review & theory framework.

Learn what goes where (and why), and how it all fit together with this free, interactive guide to the PhD literature review and theory framework.

Conclusion: Don’t be mean

So, thinking critically involves thinking like a detective in order to understand what others have written, why, and how it relates to that which came before and to your thesis. It involves not taking things at face value and questioning everything.

But, it’s not your job to be mean to other scholars. It’s your job to understand how well something was written and how relevant it is to your purposes. If you just list articles in a descriptive way, you won’t be doing this. You need instead to be critical, to ask questions, to probe the words.

Doing so will give you a voice and avoid you getting lost in sources.

Hello, Doctor…

Sounds good, doesn’t it?  Be able to call yourself Doctor sooner with our five-star rated How to Write A PhD email-course. Learn everything your supervisor should have taught you about planning and completing a PhD.

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32 comments.

Thanks this was useful!

Great! Glad you found it useful.

I am yet to write a Ph.D. literature review in English Literature on Kazuo Ishiguro. This article boosted me up to the importance of Critical and analytical thinking rather than descriptive thinking. I am also a blogger of Ph.D. https://phdstudytips.com But this information I have not written anywhere on my blog. Thanks for all efforts Dr.Max Lempriere

Thanks for the kind words. Critical thinking is so important, but so hard! I hope this article helped you in your academic journey.

Do you have any tips on how to approach a research proposal regarding structure and the do’s and don’ts ?

Thank you David

Sure – you can check out a guide we’ve written here: https://www.thephdproofreaders.com/writing/how-to-write-a-phd-proposal/

Hope this helps,

Hey Max.. This is very helpful for me. Thank u for writing this blog, i am now confident to start my review

I’m glad you are finding it useful. Good luck!

Really helpful. Thank you.

You’re welcome. I’m glad you found it useful.

Hi Dr Max, I’m about to write my Literature review. Your blog helps me a lot. However could you share with me some samples of Literature reviews in Phd?

Hi Sachin. Thanks for your kind words. I’m glad you’re finding the blog useful. I can’t offer any specific examples of literature reviews. It depends on your discipline. My advice would be to read similar PhDs in your discipline for inspiration. If in doubt, ask your supervisor or colleagues for their suggestions of particularly good examples. I hope this helps! Good luck!

Hello Dr. Max. I must say that I enjoyed in this guide to literature review, and while I initially made the same mistake about just listing different studies, I have corrected that thanks to your guide.

There is one thing that I would like to ask you. How to approach to a thesis that is rarely documented, with very small number of published and relevant papers. Obviously, future PhD. thesis is going to offer better understanding of the matter that is about to be explored by experimental study, but what to do when very small number of researchers is dealing with this subject, or all of the available literature is of old date, but there is nothing new or better than this literature from the 60’s or 70’s.

Wish you all the best, and once again thank you for this guide.

Hi Faruk, thanks for the kind words. Your struggle is a common one. If there isn’t much literature to review, your literature review will necessarily be shorter than average and that’s okay. Make sure you thoroughly review the literature that goes exist, even if it is old, and make sure that your argument in the literature review chapter is built upon this idea that the literature is poorly developed. In some ways this makes your life easier, as the gap in your literature is so large that it will be easier for you to fill it. Hope this helps!

Hello again,

Thank you for the prompt response. Yes, this definitely helps. It gives hope :)

Thanks for this article. My thesis is on a specific artist about whom very little has been written, relative to other artists. On the other hand, my general approach to the questions I am asking about this artist is interdisciplinary, which means there is a massive literature from about five different fields to review. Do you have any advice about how to manage this. I’ve written about 17,000 words, but my supervisor keeps telling me it’s not enough.

Hi! Without knowing more about your topic it’s hard to say, but I know from my own PhD that blending various literatures together in a review is tough. If you find yourself getting stuck and tied in knots, step away from the chapter/review for a few days and come back with a fresh set of eyes.

Very Very helpful Sir. I am about to start my PhD.

Welcome to the club! Good luck on your amazing PhD journey.

Dear Dr Max

I just started this course and would like to say that its contents are very useful to my current confused state of mind. Thank you for making me see the clearer picture so as not be overwhelmed by the PhD thesis writing. I was at the brink of giving up few years of work, and am so glad I came across your website and registered for the course. Thank you.

I’m glad you’re finding it useful. It’s my mission to make other students’ lives easier than mine was when I was doing my PhD, so I’m glad to see it is having the desired effect.

Thank you so much Dr. Max. It is very helpful, I joined PhD in this year 2020 in January.

You’re welcome. Thanks for reading.

Dear Dr Max ,

Good day sir and thanks for all your good work trying to make sure we get it easier than you did . am not yet in PHD class yet but in DR class .Please how soon can i start my Thesis Writing ? and how do i chose topic to write on ? Please i need help . Thanks again and God bless. Osy

Hi Osy, I’m afraid I can’t offer any advice to help you choose a topic. Have you approach any potential supervisors and asked them? They’ll be better placed to help.

This was very useful. However, I find it difficult to articulate some complex thoughts (English is not my first language). Developing a discursive writing style is my greatest challenge in doing a Ph.D. I am only able to recognize them when someone else has written them,

You might want to work with a proofreader. Check out our website for more info.

Very good pointers shared. thanks for this post.

No problem.

Thank you very much for your article. It addresses some of the many struggles PhD students seem to face. Knowing that I am not alone is a good start. I have finished my methodology and currently writing my literature review. I thought I would have enjoyed it more… but it’s a tough one! I must say I am finding it quite overwhelming particularly to organize the chapter. The first part contexualising the research is fine and done, but trying to critique the main text that acted as a springboard to my research is tough.

I am not quite sure whether I should engage with recent research that has adopted the same main text/research I am using and critically discuss those or else fuse the said recent existing research with other broader themes (which I still need to include as part of the lit review).

Getting my head around this is overwhelming!

Thanks again!

When it gets too tough, remind yourself that this stuff is meant to be difficult.

Thank you, Dr. Max. This blog is a booster for me. I am a research scholar in agribusiness I cover green marketing in agro-based industries. This blog helps me a lot.

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