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  • Steps in Conducting a Literature Review

What is a literature review?

A literature review is an integrated analysis -- not just a summary-- of scholarly writings and other relevant evidence related directly to your research question.  That is, it represents a synthesis of the evidence that provides background information on your topic and shows a association between the evidence and your research question.

A literature review may be a stand alone work or the introduction to a larger research paper, depending on the assignment.  Rely heavily on the guidelines your instructor has given you.

Why is it important?

A literature review is important because it:

  • Explains the background of research on a topic.
  • Demonstrates why a topic is significant to a subject area.
  • Discovers relationships between research studies/ideas.
  • Identifies major themes, concepts, and researchers on a topic.
  • Identifies critical gaps and points of disagreement.
  • Discusses further research questions that logically come out of the previous studies.

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1. Choose a topic. Define your research question.

Your literature review should be guided by your central research question.  The literature represents background and research developments related to a specific research question, interpreted and analyzed by you in a synthesized way.

  • Make sure your research question is not too broad or too narrow.  Is it manageable?
  • Begin writing down terms that are related to your question. These will be useful for searches later.
  • If you have the opportunity, discuss your topic with your professor and your class mates.

2. Decide on the scope of your review

How many studies do you need to look at? How comprehensive should it be? How many years should it cover? 

  • This may depend on your assignment.  How many sources does the assignment require?

3. Select the databases you will use to conduct your searches.

Make a list of the databases you will search. 

Where to find databases:

  • use the tabs on this guide
  • Find other databases in the Nursing Information Resources web page
  • More on the Medical Library web page
  • ... and more on the Yale University Library web page

4. Conduct your searches to find the evidence. Keep track of your searches.

  • Use the key words in your question, as well as synonyms for those words, as terms in your search. Use the database tutorials for help.
  • Save the searches in the databases. This saves time when you want to redo, or modify, the searches. It is also helpful to use as a guide is the searches are not finding any useful results.
  • Review the abstracts of research studies carefully. This will save you time.
  • Use the bibliographies and references of research studies you find to locate others.
  • Check with your professor, or a subject expert in the field, if you are missing any key works in the field.
  • Ask your librarian for help at any time.
  • Use a citation manager, such as EndNote as the repository for your citations. See the EndNote tutorials for help.

Review the literature

Some questions to help you analyze the research:

  • What was the research question of the study you are reviewing? What were the authors trying to discover?
  • Was the research funded by a source that could influence the findings?
  • What were the research methodologies? Analyze its literature review, the samples and variables used, the results, and the conclusions.
  • Does the research seem to be complete? Could it have been conducted more soundly? What further questions does it raise?
  • If there are conflicting studies, why do you think that is?
  • How are the authors viewed in the field? Has this study been cited? If so, how has it been analyzed?

Tips: 

  • Review the abstracts carefully.  
  • Keep careful notes so that you may track your thought processes during the research process.
  • Create a matrix of the studies for easy analysis, and synthesis, across all of the studies.
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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.

Literature review guide

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discuss the steps in conducting a literature review

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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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Research Process :: Step by Step

  • Introduction
  • Select Topic
  • Identify Keywords
  • Background Information
  • Develop Research Questions
  • Refine Topic
  • Search Strategy
  • Popular Databases
  • Evaluate Sources
  • Types of Periodicals
  • Reading Scholarly Articles
  • Primary & Secondary Sources
  • Organize / Take Notes
  • Writing & Grammar Resources
  • Annotated Bibliography
  • Literature Review
  • Citation Styles
  • Paraphrasing
  • Privacy / Confidentiality
  • Research Process
  • Selecting Your Topic
  • Identifying Keywords
  • Gathering Background Info
  • Evaluating Sources

discuss the steps in conducting a literature review

Organize the literature review into sections that present themes or identify trends, including relevant theory. You are not trying to list all the material published, but to synthesize and evaluate it according to the guiding concept of your thesis or research question.  

What is a literature review?

A literature review is an account of what has been published on a topic by accredited scholars and researchers. Occasionally you will be asked to write one as a separate assignment, but more often it is part of the introduction to an essay, research report, or thesis. In writing the literature review, your purpose is to convey to your reader what knowledge and ideas have been established on a topic, and what their strengths and weaknesses are. As a piece of writing, the literature review must be defined by a guiding concept (e.g., your research objective, the problem or issue you are discussing, or your argumentative thesis). It is not just a descriptive list of the material available, or a set of summaries

A literature review must do these things:

  • be organized around and related directly to the thesis or research question you are developing
  • synthesize results into a summary of what is and is not known
  • identify areas of controversy in the literature
  • formulate questions that need further research

Ask yourself questions like these:

  • What is the specific thesis, problem, or research question that my literature review helps to define?
  • What type of literature review am I conducting? Am I looking at issues of theory? methodology? policy? quantitative research (e.g. on the effectiveness of a new procedure)? qualitative research (e.g., studies of loneliness among migrant workers)?
  • What is the scope of my literature review? What types of publications am I using (e.g., journals, books, government documents, popular media)? What discipline am I working in (e.g., nursing psychology, sociology, medicine)?
  • How good was my information seeking? Has my search been wide enough to ensure I've found all the relevant material? Has it been narrow enough to exclude irrelevant material? Is the number of sources I've used appropriate for the length of my paper?
  • Have I critically analyzed the literature I use? Do I follow through a set of concepts and questions, comparing items to each other in the ways they deal with them? Instead of just listing and summarizing items, do I assess them, discussing strengths and weaknesses?
  • Have I cited and discussed studies contrary to my perspective?
  • Will the reader find my literature review relevant, appropriate, and useful?

Ask yourself questions like these about each book or article you include:

  • Has the author formulated a problem/issue?
  • Is it clearly defined? Is its significance (scope, severity, relevance) clearly established?
  • Could the problem have been approached more effectively from another perspective?
  • What is the author's research orientation (e.g., interpretive, critical science, combination)?
  • What is the author's theoretical framework (e.g., psychological, developmental, feminist)?
  • What is the relationship between the theoretical and research perspectives?
  • Has the author evaluated the literature relevant to the problem/issue? Does the author include literature taking positions she or he does not agree with?
  • In a research study, how good are the basic components of the study design (e.g., population, intervention, outcome)? How accurate and valid are the measurements? Is the analysis of the data accurate and relevant to the research question? Are the conclusions validly based upon the data and analysis?
  • In material written for a popular readership, does the author use appeals to emotion, one-sided examples, or rhetorically-charged language and tone? Is there an objective basis to the reasoning, or is the author merely "proving" what he or she already believes?
  • How does the author structure the argument? Can you "deconstruct" the flow of the argument to see whether or where it breaks down logically (e.g., in establishing cause-effect relationships)?
  • In what ways does this book or article contribute to our understanding of the problem under study, and in what ways is it useful for practice? What are the strengths and limitations?
  • How does this book or article relate to the specific thesis or question I am developing?

Text written by Dena Taylor, Health Sciences Writing Centre, University of Toronto

http://www.writing.utoronto.ca/advice/specific-types-of-writing/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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Literature Review: Conducting & Writing

  • Steps for Conducting a Lit Review

1. Choose a topic. Define your research question.

2. decide on the scope of your review., 3. select the databases you will use to conduct your searches., 4. conduct your searches and find the literature. keep track of your searches, 5. review the literature..

  • Finding "The Literature"
  • Organizing/Writing
  • Chicago: Notes Bibliography
  • Sample Literature Reviews

Disclaimer!!

Conducting a literature review is usually recursive, meaning that somewhere along the way, you'll find yourself repeating steps out-of-order.

That is actually a good sign.  

Reviewing the research should lead to more research questions and those questions will likely lead you to either revise your initial research question or go back and find more literature related to a more specific aspect of your research question.

Your literature review should be guided by a central research question.  Remember, it is not a collection of loosely related studies in a field but instead represents background and research developments related to a specific research question, interpreted and analyzed by you in a synthesized way.

  • Make sure your research question is not too broad or too narrow.  Is it manageable?
  • Begin writing down terms that are related to your question. These will be useful for searches later.
  • If you have the opportunity, discuss your topic with your professor.

How many studies do you need to look at? How comprehensive should it be? How many years should it cover? 

Tip: This may depend on your assignment.  How many sources does the assignment require?

Make a list of the databases you will search.  Remember to include comprehensive databases such as WorldCat and Dissertations & Theses, if you need to.

Where to find databases:

  • Find Databases by Subject UWF Databases categorized by discipline
  • Find Databases via Research Guides Librarians create research guides for all of the disciplines on campus! Take advantage of their expertise and see what discipline-specific search strategies they recommend!
  • Review the abstracts of research studies carefully. This will save you time.
  • Write down the searches you conduct in each database so that you may duplicate them if you need to later (or avoid dead-end searches   that you'd forgotten you'd already tried).
  • Use the bibliographies and references of research studies you find to locate others.
  • Ask your professor or a scholar in the field if you are missing any key works in the field.
  • Use RefWorks to keep track of your research citations. See the RefWorks Tutorial if you need help.

Some questions to help you analyze the research:

  • What was the research question of the study you are reviewing? What were the authors trying to discover?
  • Was the research funded by a source that could influence the findings?
  • What were the research methodologies? Analyze its literature review, the samples and variables used, the results, and the conclusions. Does the research seem to be complete? Could it have been conducted more soundly? What further questions does it raise?
  • If there are conflicting studies, why do you think that is?
  • How are the authors viewed in the field? Has this study been cited?; if so, how has it been analyzed?

Tips: 

  • Again, review the abstracts carefully.  
  • Keep careful notes so that you may track your thought processes during the research process.
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Conducting a Literature Review

Steps in conducting a literature review.

  • Benefits of Conducting a Literature Review
  • Summary of the Process
  • Additional Resources
  • Literature Review Tutorial by American University Library
  • The Literature Review: A Few Tips On Conducting It by University of Toronto
  • Write a Literature Review by UC Santa Cruz University Library

Conducting a literature review involves using research databases to identify materials that cover or are related in some sense to the research topic. In some cases the research topic may be so original in its scope that no one has done anything exactly like it, so research that is at least similar or related will provide source material for the literature review. The selection of databases will be driven by the subject matter and the scope of the project.

Selecting Databases -- Most academic libraries now provide access to a majority of their databases and their catalog via a so-called discovery tool. A discovery tool makes searching library systems more "Google-like" in that even the simplest of queries can be entered and results retrieved. However, many times the results are also "Google-like" in the sheer quantity of items retrieved. While a discovery tool can be invaluable for quickly finding a multitude of resources on nearly any topic, there are a number of considerations a researcher should keep in mind when using a discovery tool, especially for the researcher who is attempting a comprehensive literature review.

No discovery tool works with every database subscribed to by a library. Some libraries might subscribe to two or three hundred different research databases covering a large number of subject areas. Competing discovery systems might negotiate agreements with different database vendors in order to provide access to a large range of materials. There will be other vendors with whom agreements are not forthcoming, therefore their materials are not included in the discovery tool results. While this might be of only minor concern for a researcher looking to do a fairly limited research project, the researcher looking to do a comprehensive review of the literature in preparation for writing a master's thesis or a doctoral dissertation will run the risk of missing some materials by limiting the search just to a particular library's discovery system. If only one system covered everything that a researcher could possibly need, libraries would have no need to subscribe to hundreds of different databases. The reality is that no one tool does it all. Not even Google Scholar.

Book collections might be excluded from results delivered by a discovery tool. While many libraries are making results from their own catalogs available via their discovery tools, they might not cover books that are discoverable from other library collections, thus making a search of book collections incomplete. Most libraries subscribe to an international database of library catalogs known as WorldCat. This database will provide comprehensive coverage of books, media, and other physical library materials available in libraries worldwide.

Features available in a particular database might not be available in a discovery tool. Keep in mind that a discovery tool is a search system that enables searching across content from numerous individual databases. An individual database might have search features that cannot be provided through a discovery tool, since the discovery tool is designed to accommodate a large number of systems with a single search. For example, the nursing database  CINAHL  includes the ability to limit a search to specific practice areas, to limit to evidence-based practice, to limit to gender, and to search using medical subject headings, among other things, all specialized facets that are not available in a discovery tool. To have these advanced capabilities, a researcher would need to go directly to  CINAHL  and search it natively.

Some discovery tools are set, by default, to limit search results to those items directly available through a particular library's collections. While many researchers will be most concerned with what is immediately available to them at their own library, a researcher concerned with finding everything that has been done on a particular topic will need to go beyond what's available at his or her home library and include materials that are available elsewhere. Master's and doctoral candidates should take care to notice if their library's discovery tool automatically limits to available materials and broaden the scope to include ALL materials, not just those available.

With the foregoing in mind, a researcher might start a search by using the library's discovery tool and then follow up by reviewing which databases have been included in the search and, more importantly, which databases have not been included. Most libraries will facilitate locating its individual databases through a subject arrangement of some kind. Once those databases that are not discoverable have been identified, the researcher would do well to search them individually to find out if other materials can be identified outside of the discovery tool. One additional tool that a doctoral researcher should of necessity include in a search is ISI's  Web of Knowledge . The two major systems searchable within ISI's  Web  are the  Social Sciences Citation Index  and the  Science Citation Index . The purpose of these two systems is to enable a researcher to determine what research has been cited over the years by any number of researchers and how many times it has been cited.

Formulating an Effective Search Strategy -- Key to performing an effective literature review is selecting search terms that will effectively identify materials that are relevant to the research topic. An initial strategy for selecting search terminology might be to list all possible relevant terms and their synonyms in order to have a working vocabulary for use in the research databases. While an individual subject database will likely use a "controlled vocabulary" to index articles and other materials that are included in the database, the same vocabulary might not be as effective in a database that focuses on a different subject area. For example, terminology that is used frequently in psychological literature might not be as effective in searching a human resources management database. Brainstorming the topic before launching into a search will help a researcher arrive at a good working vocabulary to use when probing the databases for relevant literature.

As materials are identified with the initial search, the researcher will want to keep track of other terminology that could be of use in performing additional searches. Sometimes the most effective search terminology can be found by reading the abstracts of relevant materials located through a library's research databases. For example, an initial search on the concept of "mainstreaming" might lead the researcher to articles that discuss mainstreaming but which also look into the concept of "inclusion" in education. While the terms mainstreaming and inclusion are sometimes used synonymously, they really embody two different approaches to working with students having special needs. Abstracts of articles located in the initial search on mainstreaming will uncover related concepts such as inclusion and help a researcher develop a better, more effective vocabulary for fleshing out the literature review.

In addition to searching using key concepts aligned with the research topic, a researcher likely also will want to search for additional materials produced by key authors who are identified in the initial searches. As a researcher reviews items retrieved in the initial stages of the survey, he or she will begin to notice certain authors coming up over and over in relation to the topic. To make sure that no stone is left unturned, it would be advisable to search the available, relevant library databases for other materials by those key authors, just to make sure something of importance has not been missed. A review of the reference lists for each of the items identified in the search will also help to identify key literature that should be reviewed.

Locating the Materials and Composing the Review -- In many cases the items identified through the library's databases will also be available online through the same or related databases. This, however, is not always the case. When materials are not available online, the researcher should check the library's physical collections (print, media, etc.) to determine if the items are available in the library, itself. For those materials not physically available in the home library, the researcher will use interlibrary loan to procure copies from other libraries or services. While abstracts are extremely useful in identifying the right types of materials, they are no substitute for the actual items, themselves. The thorough researcher will make sure that all the key literature has been retrieved and read thoroughly before proceeding too far with the original research.

The end result of the literature review is a discussion of the central themes in the research and an overview of the significant studies located by the researcher. This discussion serves as the lead section of a paper or article that reports the findings of an original research study and sets the stage for presentation of the original study by providing a review of research that has been conducted prior to the current study. As the researcher conducts his or her own study, other relevant materials might enter into the professional literature. It is the researcher's responsibility to update the literature review with newly released information prior to completing his or her own study.

Updating the Initial Search -- Most research projects will take place over a period of time and are not completed in the short term. Especially in the case of master's and doctoral projects, the research process might take a year or several years to complete. During this time, it will be important for the researcher to periodically review the research that has been going on at the same time as his or her own research. Revisiting the search strategies employed in the initial pass of the ltierature will turn up any new studies that might have come to light since the initial search. Fortunately, most research databases and discovery systems provide researchers with the means for automatically notifying them when new materials matching the search strategy have entered the system. This requires that a researcher sign up for a personal "account" with the database in order to save his or her searches and set up "alerts" when new materials come online. Setting up an account does not involve charges to the researcher; this is all a part of the cost borne by the home library in providing access to the databases.

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

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

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

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

There are five key steps to writing a literature review:

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

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

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Table of contents

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

  • Quick Run-through
  • Step 1 & 2

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

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

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

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

Literature review guide

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

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

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

Download Word doc Download Google doc

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

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

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

Make a list of keywords

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

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

Search for relevant sources

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

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

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

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

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

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

For each publication, ask yourself:

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

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

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

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

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

Take notes and cite your sources

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

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

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

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

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

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

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

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

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

Chronological

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

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

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

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

Methodological

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

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

Theoretical

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

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

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

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

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

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

As you write, make sure to follow these tips:

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

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

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

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

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

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

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

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

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

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Literature Reviews

  • Getting started

What is a literature review?

Why conduct a literature review, stages of a literature review, lit reviews: an overview (video), check out these books.

  • Types of reviews
  • 1. Define your research question
  • 2. Plan your search
  • 3. Search the literature
  • 4. Organize your results
  • 5. Synthesize your findings
  • 6. Write the review
  • Thompson Writing Studio This link opens in a new window
  • Need to write a systematic review? This link opens in a new window

discuss the steps in conducting a literature review

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discuss the steps in conducting a literature review

Definition: A literature review is a systematic examination and synthesis of existing scholarly research on a specific topic or subject.

Purpose: It serves to provide a comprehensive overview of the current state of knowledge within a particular field.

Analysis: Involves critically evaluating and summarizing key findings, methodologies, and debates found in academic literature.

Identifying Gaps: Aims to pinpoint areas where there is a lack of research or unresolved questions, highlighting opportunities for further investigation.

Contextualization: Enables researchers to understand how their work fits into the broader academic conversation and contributes to the existing body of knowledge.

discuss the steps in conducting a literature review

tl;dr  A literature review critically examines and synthesizes existing scholarly research and publications on a specific topic to provide a comprehensive understanding of the current state of knowledge in the field.

What is a literature review NOT?

❌ An annotated bibliography

❌ Original research

❌ A summary

❌ Something to be conducted at the end of your research

❌ An opinion piece

❌ A chronological compilation of studies

The reason for conducting a literature review is to:

discuss the steps in conducting a literature review

Literature Reviews: An Overview for Graduate Students

While this 9-minute video from NCSU is geared toward graduate students, it is useful for anyone conducting a literature review.

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Writing the literature review: A practical guide

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Writing literature reviews: A guide for students of the social and behavioral sciences

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So, you have to write a literature review: A guided workbook for engineers

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Telling a research story: Writing a literature review

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The literature review: Six steps to success

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Systematic approaches to a successful literature review

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Doing a systematic review: A student's guide

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Conducting a Literature Review

What is a literature review.

A review of the literature is a compilation of the research that has been published on a topic by recognized scholars and researchers. In writing the literature review, your purpose is to convey to your reader what knowledge and ideas have been established on a topic and what their strengths and weaknesses might be.

A literature review should do the following:

A. Be organized around and related to the research question you are developing.

B. Synthesize results into a summary of what is and is not known.

C. Identify gaps or areas of controversy in the literature.

D. Formulate questions that need further research.

Conducting a Review of the Literature:

Step 1. Familiarize yourself with the scholarly journal literature by browsing the libraries’ E-Journals lists.

Step 2: Identify the keywords and phrases that describe your topic by making a list of possible synonyms.

Step 3: Select and search appropriate databases or search tools, for example:

  • Academic Search Premier (Multidisciplinary)
  • LexisNexis Academic (Current news)
  • ERIC (Scholarly and practical education literature)
  • Education Full Text (Scholarly education literature)

Things to Keep in Mind:

  • Library databases are different than Web search engines.
  • The information cycle determines where and when certain types of information are published.
  • Most topics are interdisciplinary, so don’t limit your search to one field or subject database.
  • Be aware that research is a cyclical, recursive process.

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What is a Literature Review?

A literature or narrative review is a comprehensive review and analysis of the published literature on a specific topic or research question. The literature that is reviewed contains: books, articles, academic articles, conference proceedings, association papers, and dissertations. It contains the most pertinent studies and points to important past and current research and practices. It provides background and context, and shows how your research will contribute to the field. 

A literature review should: 

  • Provide a comprehensive and updated review of the literature;
  • Explain why this review has taken place;
  • Articulate a position or hypothesis;
  • Acknowledge and account for conflicting and corroborating points of view

From  S age Research Methods

Purpose of a Literature Review

A literature review can be written as an introduction to a study to:

  • Demonstrate how a study fills a gap in research
  • Compare a study with other research that's been done

Or it can be a separate work (a research article on its own) which:

  • Organizes or describes a topic
  • Describes variables within a particular issue/problem

Limitations of a Literature Review

Some of the limitations of a literature review are:

  • It's a snapshot in time. Unlike other reviews, this one has beginning, a middle and an end. There may be future developments that could make your work less relevant.
  • It may be too focused. Some niche studies may miss the bigger picture.
  • It can be difficult to be comprehensive. There is no way to make sure all the literature on a topic was considered.
  • It is easy to be biased if you stick to top tier journals. There may be other places where people are publishing exemplary research. Look to open access publications and conferences to reflect a more inclusive collection. Also, make sure to include opposing views (and not just supporting evidence).

Source: Grant, Maria J., and Andrew Booth. “A Typology of Reviews: An Analysis of 14 Review Types and Associated Methodologies.” Health Information & Libraries Journal, vol. 26, no. 2, June 2009, pp. 91–108. Wiley Online Library, doi:10.1111/j.1471-1842.2009.00848.x.

Meryl Brodsky : Communication and Information Studies

Hannah Chapman Tripp : Biology, Neuroscience

Carolyn Cunningham : Human Development & Family Sciences, Psychology, Sociology

Larayne Dallas : Engineering

Janelle Hedstrom : Special Education, Curriculum & Instruction, Ed Leadership & Policy ​

Susan Macicak : Linguistics

Imelda Vetter : Dell Medical School

For help in other subject areas, please see the guide to library specialists by subject .

Periodically, UT Libraries runs a workshop covering the basics and library support for literature reviews. While we try to offer these once per academic year, we find providing the recording to be helpful to community members who have missed the session. Following is the most recent recording of the workshop, Conducting a Literature Review. To view the recording, a UT login is required.

  • October 26, 2022 recording
  • Last Updated: Oct 26, 2022 2:49 PM
  • URL: https://guides.lib.utexas.edu/literaturereviews

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Literature Review

  • Steps for Conducting a Lit Review
  • Finding "The Literature"
  • Organizing/Writing
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1. Choose a topic. Define your research question.

Your literature review should be guided by a central research question.  Remember, it is not a collection of loosely related studies in a field but instead represents background and research developments related to a specific research question, interpreted and analyzed by you in a synthesized way.

  • Make sure your research question is not too broad or too narrow.  Is it manageable?
  • Begin writing down terms that are related to your question. These will be useful for searches later.
  • If you have the opportunity, discuss your topic with your professor.

2. Decide on the scope of your review.

How many studies do you need to look at? How comprehensive should it be? How many years should it cover? 

Tip: This may depend on your assignment.  How many sources does the assignment require?

3. Select the databases you will use to conduct your searches.

Make a list of the databases you will search. 

  • Look at the Library's research guides in your discipline to select discipline-specific databases.  Don't forget to look at books!
  • Make an appointment with or contact your   subject librarian to make sure you aren't missing major databases.

4. Conduct your searches and find the literature. Keep track of your searches!

Tips: 

  • Review the abstracts of research studies carefully. This will save you time.
  • Write down the searches you conduct in each database so that you may duplicate them if you need to later (or avoid dead-end searches   that you'd forgotten you'd already tried).
  • Use the bibliographies and references of research studies you find to locate others.
  • Ask your professor or a scholar in the field if you are missing any key works in the field.
  • Use RefWorks to keep track of your research citations. See the RefWorks Tutorial if you need help.

5. Review the literature.

Some questions to help you analyze the research:

  • What was the research question of the study you are reviewing? What were the authors trying to discover?
  • Was the research funded by a source that could influence the findings?
  • What were the research methodologies? Analyze its literature review, the samples and variables used, the results, and the conclusions. Does the research seem to be complete? Could it have been conducted more soundly? What further questions does it raise?
  • If there are conflicting studies, why do you think that is?
  • How are the authors viewed in the field? Has this study been cited?; if so, how has it been analyzed?
  • Again, review the abstracts carefully.  
  • Keep careful notes so that you may track your thought processes during the research process.

Composing your literature review

O nce you've settled on a general pattern of organization, you're ready to write each section. There are a few guidelines you should follow during the writing stage. Here is a sample paragraph from a literature review about sexism and language to illuminate the following discussion:

  However, other studies have shown that even gender-neutral antecedents are more likely to produce masculine images than feminine ones (Gastil, 1990). Hamilton (1988) asked students to complete sentences that required them to fill in pronouns that agreed with gender-neutral antecedents such as "writer," "pedestrian," and "persons." The students were asked to describe any image they had when writing the sentence. Hamilton found that people imagined 3.3 men to each woman in the masculine "generic" condition and 1.5 men per woman in the unbiased condition. Thus, while ambient sexism accounted for some of the masculine bias, sexist language amplified the effect. (Source: Erika Falk and Jordan Mills, "Why Sexist Language Affects Persuasion: The Role of Homophily, Intended Audience, and Offense," Women and Language19:2.

Use evidence

In the example above, the writers refer to several other sources when making their point. A literature review in this sense is just like any other academic research paper. Your interpretation of the available sources must be backed up with evidence to show that what you are saying is valid.

Be selective

Select only the most important points in each source to highlight in the review. The type of information you choose to mention should relate directly to the review's focus, whether it is thematic, methodological, or chronological.

Use quotes sparingly

Falk and Mills do not use any direct quotes. That is because the survey nature of the literature review does not allow for in-depth discussion or detailed quotes from the text. Some short quotes here and there are okay, though if you want to emphasize a point, or if what the author said just cannot be rewritten in your own words. Notice that Falk and Mills do quote certain terms that were coined by the author, not common knowledge, or taken directly from the study. But if you find yourself wanting to put in more quotes, check with your instructor.

Summarize and synthesize

Remember to summarize and synthesize your sources within each paragraph as well as throughout the review. The authors here recapitulate important features of Hamilton's study, but then synthesize it by rephrasing the study's significance and relating it to their own work.

Keep your own voice

While the literature review presents others' ideas, your voice (the writer's) should remain front and center. Notice that Falk and Mills weave references to other sources into their own text, but they still maintain their own voice by starting and ending the paragraph with their own ideas and their own words. The sources support what Falk and Mills are saying.

Use caution when paraphrasing

When paraphrasing a source that is not your own, be sure to represent the author's information or opinions accurately and in your own words. In the preceding example, Falk and Mills either directly refer in the text to the author of their source, such as Hamilton, or they provide ample notation in the text when the ideas they are mentioning are not their own, for example, Gastil's. For more information, please see our handout on plagiarism .

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How to Write a Literature Review: 5 Steps for Clear and Meaningful Research

by Yen Cabag | 5 comments

how to write a literature review blog post image

If you’re a college or graduate student, you will likely have to write a thesis or dissertation. As an employee in a corporate office, you may also be called on to do some research. 

Writing an academic paper doesn’t have to be daunting when you know the different components, why they matter, and how to write them. The literature review is one of the first steps to writing an academic paper, and also one of the most important. 

What Is a Literature Review? 

A literature review is a compilation of scholarly sources that discuss the topic you are researching. Because it serves as an overview of existing research, a literature review lets you highlight relevant principles and methods, while also identifying gaps in whatever research currently exists. This builds a strong foundation for everything else in your paper. 

Note that a literature review may also be a stand-alone paper you are assigned to write. This is the case when you are called on to look into the current state of research around your topic, and to analyze and synthesize your findings. 

Writing a literature review requires you to collect, evaluate, and analyze existing publications, including journal articles and books that relate to the research question you have chosen.

Purpose of a Literature Review

The literature review is an important part of the research process. It serves the following critical functions: 

  • It helps familiarize you with the topic.
  • It helps you construct a theoretical framework and come up with a methodology for your research. 
  • It lets you place yourself within the context of other theorists and researchers. 
  • It shows readers how your paper adds to an existing debate or addresses a given gap that you highlight from existing research. 

In addition, if you’re a nonfiction author, you might want to write up a literature review to survey the existing research surrounding your topic, so you can be sure to fill any gaps and address new reader needs.

What Should Be Included in the Literature Review? 

Your literature review should include the following information: 

  • All relevant findings related to your subject, with their sources properly cited 
  • Any existing debates or controversial discussions
  • Any gaps in the existing research that you can meet in your research

How to Write a Literature Review

Since the literature review forms the backbone of your research, writing a clear and thorough review is essential. The steps below will help you do so: 

1. Search for relevant information and findings. 

In research, information published on a given subject is called “literature” or “background literature.”  Assuming you already have a clearly-defined topic, the first step you need to take is searching for the relevant literature. 

Before the boom of the internet, searching for relevant literature involved going to the library and weeding through tons of journal articles or research papers on a subject. These days, you can quickly access these articles and other publications with a simple internet search. 

Because of this, your first step will include listing down the keywords that will help you find the results you need. List down everything that is related to your research topic. For example, if your research question is “What effect does social media have on depression?” you might include specific keywords like “Facebook” and “Instagram” to find more results.

Also, because the Internet is overflowing with information and not all of it may be relevant, you will have to learn how to do an efficient search. This includes learning technical search phrases that let you refine your results.

One of the most important tools is the term “site:” which lets you specify which website to search in. 

For example, when you type “site: www.usa.gov ” followed by a space and then the keyword, the search will be done automatically only on the U.S. Data and Statistics website. 

Other tools include what we call boolean operators or search terms, which can help you focus your search: 

  • AND – helps you find sources that have more than one keyword
  • OR – helps you find sources containing one of a given number of keywords
  • NOT – lets you exclude results that contain certain keywords 

Some examples of useful databases where you can search for articles and journals are: 

  • Google Scholar
  • Project Muse – for social sciences and humanities topics
  • Medline – for biomedicine and life sciences research subjects
  • EconLit – for economic research
  • Inspec – for computer science, physics, and engineering topics

2. Evaluate your sources and select the most relevant ones.

Because you will not have the time to read every single article you find, you need to evaluate which sources will be the most relevant to your research question. First, look through the most credible sources, and also be sure to read major theories and landmark studies. 

For publications that may not be too clear in terms of credibility or undisputed authority, the following questions can help you evaluate them: 

  • What problem does this article address? 
  • What are its key concepts and how does the author define them? 
  • What key theories, models, or methods does the author use? Do they use established frameworks or a more innovative slant? 
  • What conclusions does the author reach in this study? 
  • How does this article relate to other publications in the same field? Does it add to, confirm, or refute other articles? 
  • How does this article add to your understanding of your research question? What key insights and arguments can you glean from it? 
  • What are its strengths and weaknesses? 
  • How many times has it been cited on Google Scholar? (This helps you determine how influential the article is in its field: the higher the citation count, the greater its influence.) 

3. Identify key topics, debates, and research gaps. 

After you’ve compiled your sources, it’s time to start organizing them. You can do this by first identifying any underlying themes. These can come in the form of: 

  • Patterns or trends: Are there approaches that are becoming more or less well-known over time? 
  • Themes: Are there recurring concepts that stand out to you from all the literature you compiled? 
  • Conflicts, contradictions, or debates: In what areas do your sources disagree? 
  • Landmark publications : What other study or theory is greatly impacting the way the field is developing? 
  • Research gaps: What areas have not been covered in detail in the background literature you compiled? What weaknesses do you think should be addressed in your paper? 

4. Prepare your outline. 

For academic papers, it’s always best to formulate your outline before you begin writing. This helps you organize your thoughts and all your findings into a coherent whole. 

After all, you don’t want your literature review to look like a shopping list that simply compiles every piece of information you found, without any thought as to how they all come together.

Your outline should include an introduction, main body, and conclusion. 

5. Write the contents of your literature review. 

With your outline in place, you can now start to write your literature review. 

For the introduction, establish the purpose of your literature review. Here you can explain whether the literature review is part of a larger work or if it’s a stand-alone piece. 

In the body of the paper, you will start to elaborate on the points you put in your outline. Use subheadings to make the paragraphs clearer.

These additional tips will also help you make a literature review that adds value to others: 

  • Summarize your findings: When writing your literature review, don’t just copy and paste whatever you find. Summarize and paraphrase as much as possible. 
  • Analyze: Then, add your own analysis. A literature review is valuable because of the insights you provide. 
  • Evaluate critically: Be sure to remain as objective as possible. 
  • Structure your paragraphs: Keep each paragraph to one main theme, and include transitional sentences to make each paragraph flow neatly to the next. 
  • State your references: As you write, be sure to note down which sources gave which ideas or findings. Depending on the requirements, you can use the AP Style or Chicago Style of referencing. 

How Do You Structure a Literature Review? 

You can structure your literature review in the following ways: 

  • Thematic : In a thematic outline, you will be compiling your information to revolve around a specific theme. Different parts of your research may go into different subsections that focus on certain parts of your topic. 
  • Chronological : This approach lets you show the development of your topic over time. While this is helpful in showing how theories change, be sure to add your own analysis of patterns, turning points, or debates, showing how they helped shape where the field is going. One way of doing this is interpreting how or why the specific developments happened. 
  • Methodological: In this format, you will be looking at the different research methods your sources used, comparing how they arrived at conclusions or recommendations. You can discuss how and why the different sources opted for those methods, perhaps looking at whether the source is sociological, cultural, or historical. 
  • Theoretical: A theoretical framework lets you focus on discussing the different models, theories, and key concepts surrounding your topic. 

Writing a Lit Review 

Writing a literature review does not have to be a tedious process as long as you know what you need to do.

Knowing how to choose sources will save you a lot of time and energy, and analyzing the information as you read it will also let you write more efficiently, resulting in a literature review that is useful for your own research. 

Did you find this post helpful? Let us know in the comments below!

If you enjoyed this post, then you might also like:

  • How to Write a Research Paper: The Complete Guide for Students
  • 31 Best Online Research Tools
  • 10 of the Best Citation Generators to Make Your Research Easier
  • How to Write a Thesis Statement

Yen Cabag

Yen Cabag is the Blog Writer of TCK Publishing. She is also a homeschooling mom, family coach, and speaker for the Charlotte Mason method, an educational philosophy that places great emphasis on classic literature and the masterpieces in art and music. She has also written several books, both fiction and nonfiction. Her passion is to see the next generation of children become lovers of reading and learning in the midst of short attention spans.

Patience Ami Mamattah

This article is very useful and has helped me understand better how to approach my literature review. Thank you

Anita Patel

Wonderfully concise, easily understood and makes me feel I can do this! Thank you Yen, you have filled my day with hope and confidence.

Kaelyn Barron

We’re so glad Yen’s post has helped you! :)

Nihada Suleiman Burinyuy

It has really helped me to do my research thank you.

You’re very welcome, we’re so happy to help!

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Research Process Guide

  • Step 1 - Identifying and Developing a Topic
  • Step 2 - Narrowing Your Topic
  • Step 3 - Developing Research Questions
  • Step 4 - Conducting a Literature Review
  • Step 5 - Choosing a Conceptual or Theoretical Framework
  • Step 6 - Determining Research Methodology
  • Step 6a - Determining Research Methodology - Quantitative Research Methods
  • Step 6b - Determining Research Methodology - Qualitative Design
  • Step 7 - Considering Ethical Issues in Research with Human Subjects - Institutional Review Board (IRB)
  • Step 8 - Collecting Data
  • Step 9 - Analyzing Data
  • Step 10 - Interpreting Results
  • Step 11 - Writing Up Results

Step 4: Conducting a Literature Review

discuss the steps in conducting a literature review

In order to understand your topic, before you conduct your research, it is extremely important to immerse yourself in the research that has been done on your topic and the topics that might be adjacent to your particular research interest or questions. “a researcher cannot perform significant research without first understanding the literature in the field” (Boote & Beile, 2005, p. 3). Essentially, When writing a thesis or research proposal, the review of the literature would be your Chapter 2 .

Frankly, the literature review is often the first major challenge of the writing process. Sometimes, the task to review and synthesize all of the previous research on and around your topic can feel overwhelming. Although the literature review is foundational to situate your research within the body of literature on your topic, there is almost no literature on the challenges and pitfalls of writing a literature review (Randolph, 2009).

Boote and Beile (2005) reveal through their research on dissertation writing, that although a sophisticated literature review is essential for substantial research, they are often poorly written and lack organizational structure and conceptual relevance. So, the question is, how can you write a literature that is well-organized, comprehensive and situate your research within the literature?

Onweugbuzie et al. (2012) identify 23 core components of an effective literature review in their research and are referred to as the standard checklist for most empirical researchers. The list includes the following:

  • What has been researched and what needs to be in the future.
  • Identify variables within the literature that are relevant to your study.
  • Identify the relationship between theory and practice within the literature.
  • Discuss the quality of research with particular emphasis on the exemplary studies.
  • Examine the methodologies and research design used throughout the literature, and evaluate the efficacy.
  • Pay attention to any contradictions within the literature and
  • Make sure to not replicate studies that have already been completed, however, if there are similarities, identify how your study and variables examined are important, different, and relevant.

How to complete a literature review

Fair Warning: The literature review is often time-consuming and can feel like an endless process.  Don’t Give Up! It is the first major hurdle of the research proposal process. Once you have completed the literature review, you will have a good idea of what is significant, relevant and novel about your research. The key is to spend time reading, recording important findings, and organizing the scholarly literature on (and around) your topic.

At this point, it is important to distinguish between scholarly literature and other sources. You need to keep in mind that you are only reviewing scholarly literature, which includes sources and studies that have a clear methodology, empirical evidence, results and conclusions. These studies are PEER-REVIEWED, meaning, contemporaries in the field have reviewed the research methods and findings of the literature, and found them relevant, significant, authentic and valid (Wakefield, 2015).

Where do you begin? Great question.

According to Randolph (2009), the goal of a literature review is to integrate and generalize findings across studies, debate findings within a field, resolve the debate, and discuss the language specific to the field. For a meta-analysis, which is a common strategy for a literature review, the goal is largely to integrate quantitative findings across the research on the topic. For other strategies to complete the literature review, the goals may be to critically analyze previous studies, identify central themes or issues within the existing literature or analyze an argument in the field (Randolph, 2009). In literature reviews for dissertation, the goal is to largely interrogate and analyze the current findings to find weaknesses or contradictions in order to place your study within the context of the current literature and to justify your study’s relevance.  So in essence, the goals of literature review, regardless of the strategy, are not only to deal with the central theme across the literature and to present a thematic analysis of that literature, but also, and perhaps more importantly, it is to focus on whether the body of knowledge is credible, reliable and valid based on the methodological approaches and outcomes of the literature in the field (Wakefield, 2015).

A few initial steps are:

  • Develop a list of key words and phrases that relate to your topic and questions (Denney & Tewksbury, 2013).
  • Search for relevant sources using useful databases found in Kean University’s Library :
  • Kean University’s WorldCat Discovery single-search application
  • ERIC (education)
  • JSTOR (multidisciplinary)
  • Project Muse (humanities and social science)
  • Web of Science (citation searching)
  • Google Scholar
  • Set up an account with a bibliographic citation manager like EndNote Online (access provided by Kean University) or a freely available option such as Zotero. The EndNote Online Guide provides separate on-campus and off-campus account registration instructions. A bibliographic citation manager will not only help you manage and organize your sources, but it will also help you format your references in various citation styles.
  • Take advantage of research support options provided by Kean’s librarians, including workshops , appointments with a librarian , and 24/7 Chat .

If you identify a source (article or book) that is not available through Kean University’s library collections, you may submit an Interlibrary Loan request. Book or article records found in the WorldCat Discovery database will feature an Interlibrary Loan request option. However, you may also utilize the Interlibrary Loan form .

You may also use the VALE Reciprocal Borrowing Program , which enables Kean University students and faculty to check out books from libraries at other New Jersey colleges and universities. To participate in this program, a researcher must first obtain a signed "VALE Reciprocal Borrowing Application Form" from the Nancy Thompson Learning Commons before they can borrow at one of the participating libraries .

What are the sources that are appropriate for a literature review? According to Garrard (2009) and others scientific or empirical research refers to the:

         …theoretical and research publications in scientific journals, reference books, government practice, policy statements, and other materials          about the theory, practice, and results of scientific inquiry. These materials and publications are produced by individuals or groups in          universities, foundations, government research laboratories, and other nonprofit or for-profit organizations (p.4). Onwuegbuzie et al. (2010; as cited in Onwuegbuzie et al., 2012) goes further and describes the literature that could be included in a literature review, “research articles,… essays, article reviews, monographs, dissertations, books, Internet websites, video, interview transcripts, encyclopedias, company reports, trade catalogues, government documents, congressional/parliamentary bills…” (p. 7). However, Onwuegbuzie et al. (2012) builds on this definition, by saying that a literature review is largely, “a systematic, explicit, and reproducible method for identifying, evaluating, and synthesizing the existing body of completed and recorded work produced by researchers, scholars and practitioners” (p.3).

So, what does this mean for you, the researcher and author of the literature review? You want to use multiple source types. Additionally, stick to the parameters laid out by Onwuegbuzie et al. (2012)  in that the literature reviewed should be an evaluation and synthesis of the existing work completed by “researchers, scholars and practitioners.” The list of sources should be semi-exhaustive and representative of the field.

Next, you should:

     3. Evaluate and select your sources. Read the abstract first to see if the source is relevant to your topic (Wakefield, 2015; Denney & Tewksbury, 2013; Randolph, 2009).

  • Is this source peer-reviewed?
  • Is this source presenting empirical evidence, meeting the threshold for scholarly research?
  • Is this topic relevant to my research topic/questions?

Organizing your Literature Review:

Outline your literature review- how do you want it organized? You are “synthesizing” the literature as your purpose here. What structure works best for your topic and study? The most common formats are (Randolph, 2009; Onwuegbuzie et al., 2012):

  • Historical format - literature is reviewed chronologically.This method is preferred when there is a goal of analyzing the progression of research methods, theories or practices over time.
  • Conceptual format - centered arounds the propositions in research rationale or a theoretical- centered review which is organized according to the theories in the literature.
  • Methodological format - this involves the discussion of methodology  as in an imperial paper including an introduction, method, results and discussion. This approach is most commonly used in meta- analytical reports.

Let’s talk about synthesis.

A literature review is not only a review of the empirical research, but it is also evaluation and synthesis of the research. Boote and Beile (2005) have created a five- category list for evaluating a literature review. The categories are coverage, synthesis, methodology, significance, and rhetoric .

  • You need to create a justified criteria for including and excluding studies from your review
  • You need to discuss what has been done in the field and what still needs to be done.
  • Place the topic or problem within the greater context of scholarly literature.
  • Place the topic or problem within the historical context.
  • Discuss the subject vocabulary.
  • Articulate the important variables and phenomena that are relevant to the topic.
  • Synthesize and discuss a new perspective on the literature.
  • Identify the main methods and research techniques that have been used in the field as well as their advantages/disadvantages.
  • Relate ideas and theories to research methodologies.
  • Rationalize the practical significance of the research problem.
  • Rationalize the scholarly significance of the research problem.
  • Write in coherent language and be sure the organization/ structure of the review makes sense.

Synthesis is difficult - you need to articulate what this literature means for your research and/or how does the literature inform the purpose, impact, methodology of your study? Rather than summarizing, the idea behind synthesis is taking the information you have discussed and drawing your own conclusions, making connections between the literature and your study.

Boote, D. N., & Beile, P. (2005). Scholars before researchers: On the centrality of the dissertation literature review in research preparation. Educational Researcher, 34 (6), 3-15. https://www.jstor.org/stable/3699805

Denney, A. S., & Tewksbury, R. (2013). How to write a literature review. Journal of Criminal Justice Education, 24 (2), 218-234. https://doi-org.kean.idm.oclc.org/10.1080/10511253.2012.730617

Garrard, J. (2009). Health sciences literature review made easy: The matrix method.  Jones and Bartlett.

Onwuegbuzie, A. J., Leech, N. L., & Collins, K. M. (2012). Qualitative analysis techniques for the review of the literature. Qualitative Report, 17( 28), 1-28.

Randolph, J. (2009). A guide to writing the dissertation literature review. Practical Assessment, Research, and Evaluation, 14 (1), 13.

Wakefield, A. (2015). Synthesising the literature as part of a literature review. Nursing Standard, 29 (29), 44-51. https://doi.org/10.7748/ns.29.29.44.e8957

  • Last Updated: Jun 29, 2023 1:35 PM
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How to write a Literature Review: Literature review process

  • Literature review process
  • Purpose of a literature review
  • Evaluating sources
  • Managing sources
  • Request a literature search
  • Selecting the approach to use
  • Quantitative vs qualitative method
  • Summary of different research methodologies
  • Research design vs research methodology
  • Diagram: importance of research
  • Attributes of a good research scholar

Step 1: Select a topic

  • Select a topic you can manage in the time frame you have to complete your project.
  • Establish your research questions and organize your literature into logical categories around the subject/ topic areas of your questions.  Your research questions must be specific enou gh to guide you to the relevant literature.
  • Make sure you understand the concept of ‘broader’ and ‘narrower’ terms.  The narrower your topic, the easier it will be to limit the number of sources you need to read in order to get a good survey of the literature.

Step 2: Identify the most relevant sources on your topic

Use a variety of resources - locate books , journals , and documents that contain useful information and ideas on your topic. Internet sites , theses & dissertations , conference papers , ePrints and government or industry reports can also be included. Do not rely solely on electronic full-text material which is more easily available. Reference sources such as dictionaries can assist in defining terminology, and encyclopaedias may provide useful introductions to your topic by experts in the field and will list key references.

Step 3 : Search and refine

  • Unisa has a number of databases that provide full text access to articles, that allow you to refine your search to ‘peer reviewed’ journals.  These are scholarly journals which go through a rigorous process of quality assessment by several researchers or subject specialists in the academic community before they are accepted for publication. 
  • Use the And, Or, Not operators, Wildcards and Logical Brackets when searching in the databases.  For instance, you can use And to narrow your search while the operator OR expands your search.  Not, on the other hand, helps to exclude irrelevant information from your search results.  Please click here for more information on searching.

Literature review process - an overview

Step 3: search and refine.

  • Unisa has a number of  databases  that provide full text access to articles, that allow you to refine your search to ‘peer reviewed’ journals.  These are scholarly journals which go through a rigorous process of quality assessment by several researchers or subject specialists in the academic community before they are accepted for publication. 
  • Use the  And, Or, Not  operators,  Wildcards  and  Logical Brackets  when searching in the databases.  For instance, you can use  And  to narrow your search while  the  operator  OR  expands your search.   Not,  on the other hand,   helps to exclude   irrelevant information from your search results.  Please click  here  for more information on searching.

How do I write a literature review

See the chapter below for a helpful overview of the literature review process, especially the sections on how to analyse the literature you have gathered and how to write up your literature review:

Literature Reviews and Bibliographic Searches. 2006. In V. Desai, & R. Potter (Eds.),  Doing Development Research.  (pp. 209-222). London, England: SAGE Publications, Ltd. Available at:  http://0-dx.doi.org.oasis.unisa.ac.za/10.4135/9781849208925.n22     (A student will be prompted at some stage for his/ her student number and myUnisa password. A staff member will be prompted at some stage for his/ her Unisa Network username and login password).

This book is available in the  Sage Research Methods Online  database.

Step 4: Read and analyse

Group the sources into the  themes  and  sub-themes  of your topic.  As you read widely but selectively in your topic area, consider what themes or issues connect your sources together.

  • Do they present one or different solutions?
  • Is there an aspect of the field that is missing?
  • How well do they present the material and do they portray it according to an appropriate theory?
  • Do they reveal a trend in the field?
  • A raging debate?
  • Pick one of these themes to focus the organization of your review.

Step 5: Write the literature review

You can organize the review in many ways; for example, you can center the review  historically  (how the topic has been dealt with over time); or center it on the  theoretical positions  surrounding your topic (those for a position vs. those against, for example); or you can focus on how each of your sources contributes to your understanding of your project.

Your literature review should include:

  • an  introduction  which explains how your review is organized.
  • a  body  which contains the  headings  and  subheadings  that provide a map to show the various perspectives of your argument. In other words the body contains the evaluation of the materials you want to include on your topic.
  • a  summary .

Some of the information on this page is indebted to the sources below:

Caldwell College Library

Monmouth University Library

University of Cape Town Libraries

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  • v.96(3); 2003 Mar

Five steps to conducting a systematic review

Regina kunz.

1 German Cochrane Centre, Freiburg and Department of Nephrology, Charité, Berlin, Germany

Jos Kleijnen

2 Centre for Reviews and Dissemination, York, UK

3 German Cochrane Centre, Freiburg, Germany

Systematic reviews and meta-analyses are a key element of evidence-based healthcare, yet they remain in some ways mysterious. Why did the authors select certain studies and reject others? What did they do to pool results? How did a bunch of insignificant findings suddenly become significant? This paper, along with a book 1 that goes into more detail, demystifies these and other related intrigues.

A review earns the adjective systematic if it is based on a clearly formulated question, identifies relevant studies, appraises their quality and summarizes the evidence by use of explicit methodology. It is the explicit and systematic approach that distinguishes systematic reviews from traditional reviews and commentaries. Whenever we use the term review in this paper it will mean a systematic review . Reviews should never be done in any other way.

In this paper we provide a step-by-step explanation—there are just five steps—of the methods behind reviewing, and the quality elements inherent in each step (Box 1). For purposes of illustration we use a published review concerning the safety of public water fluoridation, but we must emphasize that our subject is review methodology, not fluoridation.

EXAMPLE: SAFETY OF PUBLIC WATER FLUORIDATION

You are a public health professional in a locality that has public water fluoridation. For many years, your colleagues and you have believed that it improves dental health. Recently there has been pressure from various interest groups to consider the safety of this public health intervention because they fear that it is causing cancer. Public health decisions have been based on professional judgment and practical feasibility without explicit consideration of the scientific evidence. (This was yesterday; today the evidence is available in a York review 2 , 3 , identifiable on MEDLINE through the freely accessible PubMed clinical queries interface [ http://www.ncbi.nlm.nib.gov/entrez/query/static/clinical.html ], under ‘systematic reviews’.)

STEP 1: FRAMING THE QUESTION

The research question may initially be stated as a query in free form but reviewers prefer to pose it in a structured and explicit way. The relations between various components of the question and the structure of the research design are shown in Figure 1 . This paper focuses only on the question of safety related to the outcomes described below.

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Structured questions for systematic reviews and relations between question components in a comparative study

Box 1 The steps in a systematic review

The problems to be addressed by the review should be specified in the form of clear, unambiguous and structured questions before beginning the review work. Once the review questions have been set, modifications to the protocol should be allowed only if alternative ways of defining the populations, interventions, outcomes or study designs become apparent

The search for studies should be extensive. Multiple resources (both computerized and printed) should be searched without language restrictions. The study selection criteria should flow directly from the review questions and be specified a priori . Reasons for inclusion and exclusion should be recorded

Study quality assessment is relevant to every step of a review. Question formulation (Step 1) and study selection criteria (Step 2) should describe the minimum acceptable level of design. Selected studies should be subjected to a more refined quality assessment by use of general critical appraisal guides and design-based quality checklists (Step 3). These detailed quality assessments will be used for exploring heterogeneity and informing decisions regarding suitability of meta-analysis (Step 4). In addition they help in assessing the strength of inferences and making recommendations for future research (Step 5)

Data synthesis consists of tabulation of study characteristics, quality and effects as well as use of statistical methods for exploring differences between studies and combining their effects (meta-analysis). Exploration of heterogeneity and its sources should be planned in advance (Step 3). If an overall meta-analysis cannot be done, subgroup meta-analysis may be feasible

The issues highlighted in each of the four steps above should be met. The risk of publication bias and related biases should be explored. Exploration for heterogeneity should help determine whether the overall summary can be trusted, and, if not, the effects observed in high-quality studies should be used for generating inferences. Any recommendations should be graded by reference to the strengths and weaknesses of the evidence

Free-form question

Is it safe to provide population-wide drinking water fluoridation to prevent caries?

Structured question

  • The populations —Populations receiving drinking water sourced through a public water supply
  • The interventions or exposures —Fluoridation of drinking water (natural or artificial) compared with non-fluoridated water
  • The outcomes —Cancer is the main outcome of interest for the debate in your health authority
  • The study designs —Comparative studies of any design examining the harmful outcomes in at least two population groups, one with fluoridated drinking water and the other without. Harmful outcomes can be rare and they may develop over a long time. There are considerable difficulties in designing and conducting safety studies to capture these outcomes, since a large number of people need to be observed over a long period. These circumstances demand observational, not randomized studies. With this background, systematic reviews on safety have to include evidence from studies with a range of designs.

STEP 2: IDENTIFYING RELEVANT PUBLICATIONS

To capture as many relevant citations as possible, a wide range of medical, environmental and scientific databases were searched to identify primary studies of the effects of water fluoridation. The electronic searches were supplemented by hand searching of Index Medicus and Excerpta Medica back to 1945. Furthermore, various internet engines were searched for web pages that might provide references. This effort resulted in 3246 citations from which relevant studies were selected for the review. Their potential relevance was examined, and 2511 citations were excluded as irrelevant. The full papers of the remaining 735 citations were assessed to select those primary studies in man that directly related to fluoride in drinking water supplies, comparing at least two groups. These criteria excluded 481 studies and left 254 in the review. They came from thirty countries, published in fourteen languages between 1939 and 2000. Of these studies 175 were relevant to the question of safety, of which 26 used cancer as an outcome.

STEP 3: ASSESSING STUDY QUALITY

Design threshold for study selection.

Adequate study design as a marker of quality, is listed as an inclusion criterion in Box 1. This approach is most applicable when the main source of evidence is randomized studies. However, randomized studies are almost impossible to conduct at community level for a public health intervention such as water fluoridation. Thus, systematic reviews assessing the safety of such interventions have to include evidence from a broader range of study designs. Consideration of the type and amount of research likely to be available led to inclusion of comparative studies of any design. In this way, selected studies provided information about the harmful effects of exposure to fluoridated water compared with non-exposure.

Quality assessment of safety studies

After studies of an acceptable design have been selected, their in-depth assessment for the risk of various biases allows us to gauge the quality of the evidence in a more refined way. Biases either exaggerate or underestimate the ‘true’ effect of an exposure. The objective of the included studies was to compare groups exposed to fluoridated drinking water and those without such exposure for rates of undesirable outcomes, without bias. Safety studies should ascertain exposures and outcomes in such a way that the risk of misclassification is minimized. The exposure is likely to be more accurately ascertained if the study was prospective rather than retrospective and if it was started soon after water fluoridation rather than later. The outcomes of those developing cancer (and remaining free of cancer) are likely to be more accurately ascertained if the follow-up was long and if the assessment was blind to exposure status.

When examining how the effect of exposure on outcome was established, reviewers assessed whether the comparison groups were similar in all respects other than their exposure to fluoridated water. This is because the other differences may be related to the outcomes of interest independent of the drinking-water fluoridation, and this would bias the comparison. For example, if the people exposed to fluoridated water had other risk factors that made them more prone to have cancer, the apparent association between exposure and outcome might be explained by the more frequent occurrence of these factors among the exposed group. The technical word for such defects is confounding. In a randomized study, confounding factors are expected to be roughly equally distributed between groups. In observational studies their distribution may be unequal. Primary researchers can statistically adjust for these differences, when estimating the effect of exposure on outcomes, by use of multivariable modelling.

Put simply, use of a prospective design, robust ascertainment of exposure and outcomes, and control for confounding are the generic issues one would look for in quality assessment of studies on safety. Consequently, studies may range from satisfactorily meeting quality criteria, to having some deficiencies, to not meeting the criteria at all, and they can be assigned to one of three prespecified quality categories as shown in Table 1 . A quality hierarchy can then be developed, based on the degree to which studies comply with the criteria. None of the studies on cancer were in the high-quality category, but this was because randomized studies were non-existent and control for confounding was not always ideal in the observational studies. There were 8 studies of moderate quality and 18 of low quality.

Description of quality assessment of studies on safety of public water fluoridation

STEP 4: SUMMARIZING THE EVIDENCE

To summarize the evidence from studies of variable design and quality is not easy. The original review 3 provides details of how the differences between study results were investigated and how they were summarized (with or without meta-analysis). This paper restricts itself to summarizing the findings narratively. The association between exposure to fluoridated water and cancer in general was examined in 26 studies. Of these, 10 examined all-cause cancer incidence or mortality, in 22 analyses. Of these, 11 analyses found a negative association (fewer cancers due to exposure), 9 found a positive one and 2 found no association. Only 2 studies reported statistically significant differences. Thus no clear association between water fluoridation and increased cancer incidence or mortality was apparent. Bone/joint and thyroid cancers were of particular concern because of fluoride uptake by these organs. Neither the 6 studies of osteosarcoma nor the 2 studies of thyroid cancer and water fluoridation revealed significant differences. Overall no association was detected between water fluoridation and mortality from any cancer. These findings were also borne out in the moderate-quality subgroup of studies.

STEP 5: INTERPRETING THE FINDINGS

In the fluoridation example, the focus was on the safety of a community-based public health intervention. The generally low quality of available studies means that the results must be interpreted with caution. However, the elaborate efforts in searching an unusually large number of databases provide some safeguard against missing relevant studies. Thus the evidence summarized in this review is likely to be as good as it will get in the foreseeable future. Cancer was the harmful outcome of most interest in this instance. No association was found between exposure to fluoridated water and specific cancers or all cancers. The interpretation of the results may be generally limited because of the low quality of studies, but the findings for the cancer outcomes are supported by the moderate-quality studies.

After having spent some time reading and understanding the review, you are impressed by the sheer amount of published work relevant to the question of safety. However, you are somewhat disappointed by the poor quality of the primary studies. Of course, examination of safety only makes sense in a context where the intervention has some beneficial effect. Benefit and harm have to be compared to provide the basis for decision making. On the issue of the beneficial effect of public water fluoridation, the review 3 reassures you that the health authority was correct in judging that fluoridation of drinking water prevents caries. From the review you also discovered that dental fluorosis (mottled teeth) was related to concentration of fluoride. When the interest groups raise the issue of safety again, you will be able to declare that there is no evidence to link cancer with drinking-water fluoridation; however, you will have to come clean about the risk of dental fluorosis, which appears to be dose dependent, and you may want to measure the fluoride concentration in the water supply and share this information with the interest groups.

The ability to quantify the safety concerns of your population through a review, albeit from studies of moderate to low quality, allows your health authority, the politicians and the public to consider the balance between beneficial and harmful effects of water fluoridation. Those who see the prevention of caries as of primary importance will favour fluoridation. Others, worried about the disfigurement of mottled teeth, may prefer other means of fluoride administration or even occasional treatment for dental caries. Whatever the opinions on this matter, you are able to reassure all parties that there is no evidence that fluoridation of drinking water increases the risk of cancer.

With increasing focus on generating guidance and recommendations for practice through systematic reviews, healthcare professionals need to understand the principles of preparing such reviews. Here we have provided a brief step-by-step explanation of the principles. Our book 1 describes them in detail.

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Evidence Syntheses and Systematic Reviews: Overview

  • Choosing a Review

Analyze and Report

What is evidence synthesis.

Evidence Synthesis: general term used to refer to any method of identifying, selecting, and combining results from multiple studies. There are several types of reviews which fall under this term; the main ones are in the table below: 

Types of Reviews

General steps for conducting systematic reviews.

The number of steps for conducting Evidence Synthesis varies a little, depending on the source that one consults. However, the following steps are generally accepted in how Systematic Reviews are done:

  • Identify a gap in the literature and form a well-developed and answerable research question which will form the basis of your search
  • Select a framework that will help guide the type of study you’re undertaking
  • Different guidelines are used for documenting and reporting the protocols of your systematic review before the review is conducted. The protocol is created following whatever guideline you select.
  • Select Databases and Grey Literature Sources
  • For steps 3 and 4, it is advisable to consult a librarian before embarking on this phase of the review process. They can recommend databases and other sources to use and even help design complex searches.
  • A protocol is a detailed plan for the project, and after it is written, it should be registered with an appropriate registry.
  • Search Databases and Other Sources
  • Not all databases use the same search syntax, so when searching multiple databases, use search syntaxes that would work in individual databases.
  • Use a citation management tool to help store and organize your citations during the review process; great help when de-duplicating your citation results
  • Inclusion and exclusion criteria already developed help you remove articles that are not relevant to your topic. 
  • Assess the quality of your findings to eliminate bias in either the design of the study or in the results/conclusions (generally not done outside of Systematic Reviews).

Extract and Synthesize

  • Extract the data from what's left of the studies that have been analyzed
  • Extraction tools are used to get data from individual studies that will be analyzed or summarized. 
  • Synthesize the main findings of your research

Report Findings

Report the results using a statistical approach or in a narrative form.

Need More Help?

Librarians can:

  • Provide guidance on which methodology best suits your goals
  • Recommend databases and other information sources for searching
  • Design and implement comprehensive and reproducible database-specific search strategies 
  • Recommend software for article screening
  • Assist with the use of citation management
  • Offer best practices on documentation of searches

Related Guides

  • Literature Reviews
  • Choose a Citation Manager
  • Project Management

Steps of a Systematic Review - Video

  • Next: Choosing a Review >>
  • Last Updated: Feb 16, 2024 5:40 PM
  • URL: https://guides.smu.edu/evidencesyntheses

IMAGES

  1. Steps of Literature Review stock image. Image of search

    discuss the steps in conducting a literature review

  2. Guidance on Conducting a Systematic Literature Review

    discuss the steps in conducting a literature review

  3. Stages for conducting a systematic literature review

    discuss the steps in conducting a literature review

  4. Literature Review

    discuss the steps in conducting a literature review

  5. The Literature Review Process

    discuss the steps in conducting a literature review

  6. Chapter 3: How to Get Started

    discuss the steps in conducting a literature review

VIDEO

  1. Conducting Literature Review for Project

  2. Review of literature

  3. Write Your Literature Review FAST

  4. Literature Review 101

  5. Literature Review In ONE Day

  6. Lecture 14: Meta Analysis

COMMENTS

  1. Steps in Conducting a Literature Review

    1. Choose a topic. Define your research question. Your literature review should be guided by your central research question. The literature represents background and research developments related to a specific research question, interpreted and analyzed by you in a synthesized way.

  2. Steps in the Literature Review Process

    Steps in the Literature Review Process Define the research question (for more ) You may need to some exploratory searching of the literature to get a sense of scope, to determine whether you need to narrow or broaden your focus

  3. How to Write a Literature Review

    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

  4. Literature Review

    Organize the literature review into sections that present themes or identify trends, including relevant theory. You are not trying to list all the material published, but to synthesize and evaluate it according to the guiding concept of your thesis or research question. What is a Literature Review? Explained with a REAL Example | Scribbr 🎓 Share

  5. PDF CHAPTER 3 Conducting a Literature Review

    The chapter then offers concrete steps taken to construct a literature review including identifying what sources are needed, how to find the sources, a systematic method to summarize and synthesize the sources, and organizational and writing strat- egies to produce an excellent literature review. Finally, pitfalls

  6. Writing a Literature Review

    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 ...

  7. Steps for Conducting a Lit Review

    Steps for Conducting a Lit Review - Literature Review: Conducting & Writing - LibGuides at University of West Florida Libraries Literature Review: Conducting & Writing 1. Choose a topic. Define your research question. Your literature review should be guided by a central research question.

  8. How to Write a Literature Review: Six Steps to Get You from ...

    Step One: Decide on your areas of research: Before you begin to search for articles or books, decide beforehand what areas you are going to research. Make sure that you only get articles and books in those areas, even if you come across fascinating books in other areas. A literature review I am currently working on, for example, explores ...

  9. Steps in Conducting a Literature Review

    Conducting a literature review involves using research databases to identify materials that cover or are related in some sense to the research topic.

  10. What is a Literature Review?

    A literature review is a survey of scholarly sources on a specific topic. It provides an overview of current knowledge, allowing you to identify relevant theories, methods, and gaps in the existing research. There are five key steps to writing a literature review: Search for relevant literature. Evaluate sources. Identify themes, debates and gaps.

  11. PDF Conducting a Literature Review

    An overview of the subject, issue or theory under consideration, along with the objectives of the literature review. Division of works under review into categories (e.g. those in support of a particular position, those against, and those offering alternative theses entirely)

  12. Getting started

    What is a literature review? Definition: A literature review is a systematic examination and synthesis of existing scholarly research on a specific topic or subject. Purpose: It serves to provide a comprehensive overview of the current state of knowledge within a particular field. Analysis: Involves critically evaluating and summarizing key findings, methodologies, and debates found in ...

  13. Conducting a Literature Review

    Conducting a Review of the Literature: Step 1. Familiarize yourself with the scholarly journal literature by browsing the libraries' E-Journals lists. Step 2: Identify the keywords and phrases that describe your topic by making a list of possible synonyms. Step 3: Select and search appropriate databases or search tools, for example:

  14. What is a literature review?

    A literature or narrative review is a comprehensive review and analysis of the published literature on a specific topic or research question. The literature that is reviewed contains: books, articles, academic articles, conference proceedings, association papers, and dissertations. It contains the most pertinent studies and points to important ...

  15. Steps for Conducting a Lit Review

    1. Choose a topic. Define your research question. Your literature review should be guided by a central research question. Remember, it is not a collection of loosely related studies in a field but instead represents background and research developments related to a specific research question, interpreted and analyzed by you in a synthesized way.

  16. Chapter 9 Methods for Literature Reviews

    As explained in Templier and Paré (2015), there are six generic steps involved in conducting a review article: formulating the research question (s) and objective (s), searching the extant literature, screening for inclusion, assessing the quality of primary studies, extracting data, and analyzing data.

  17. How to Write a Literature Review: 5 Steps for Clear and Meaningful

    1. Search for relevant information and findings. In research, information published on a given subject is called "literature" or "background literature." Assuming you already have a clearly-defined topic, the first step you need to take is searching for the relevant literature.

  18. Guidance on Conducting a Systematic Literature Review

    In this article, through a systematic search on the methodology of literature review, we categorize a typology of literature reviews, discuss steps in conducting a systematic literature review, and provide suggestions on how to enhance rigor in literature reviews in planning education and research. Introduction

  19. Reviewing literature for research: Doing it the right way

    Review of research literature can be summarized into a seven step process: (i) Selecting research questions/purpose of the literature review (ii) Selecting your sources (iii) Choosing search terms (iv) Running your search (v) Applying practical screening criteria (vi) Applying methodological screening criteria/quality appraisal (vii) Synthesizin...

  20. Guidance on Conducting a Systematic Literature Review

    reviews. In this article, through a systematic search on the methodology of literature review, we categorize a typology of literature reviews, discuss steps in conducting a systematic literature review, and provide suggestions on how to enhance rigor in literature reviews in planning education and research. Keywords

  21. PDF What is a Literature Review?

    written is a crucial component of understanding what a literature review is and often poses the greatest challenge to students. Before we discuss the steps in under-taking a literature review we need to examine what differentiates it from other types of academic writing. Essay Writing versus Writing a Literature Review

  22. Step 4

    In order to understand your topic, before you conduct your research, it is extremely important to immerse yourself in the research that has been done on your topic and the topics that might be adjacent to your particular research interest or questions. "a researcher cannot perform significant research without first understanding the literature in the field" (Boote & Beile, 2005, p. 3).

  23. Literature review process

    Sage Research Methods Step 1: Select a topic Select a topic you can manage in the time frame you have to complete your project. Establish your research questions and organize your literature into logical categories around the subject/ topic areas of your questions.

  24. Five steps to conducting a systematic review

    STEP 1: FRAMING THE QUESTION The research question may initially be stated as a query in free form but reviewers prefer to pose it in a structured and explicit way. The relations between various components of the question and the structure of the research design are shown in Figure 1 .

  25. Evidence Syntheses and Systematic Reviews: Overview

    Narrative literature review: Standalone review (not to be confused with a literature review in an empirical study), may be broad or focused, represents a range of levels of comprehensiveness ... General Steps for Conducting Systematic Reviews. The number of steps for conducting Evidence Synthesis varies a little, depending on the source that ...