literature review concept matrix

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Writing Resources

The matrix method for literature reviews.

This handout is available for download in DOCX format and PDF format .

What is the Matrix Method, and why should I use it?

Using a review matrix enables you to quickly compare and contrast articles in order to determine the scope of research across time. A review matrix can help you more easily spot differences and similarities between journal articles about a research topic. While they may be helpful in any discipline, review matrices are especially helpful for health sciences literature reviews covering the complete scope of a research topic over time. This guide focuses on the review matrix step in the literature review process and offers tips on how to use it effectively.

Organize your sources

Once you complete your research, organize your source by date in order to make it easier to see changes in research over time.

Begin by creating the blank matrix. The matrices can be easily constructed using table-making software such as Microsoft Excel, Word or OneNote, Google Sheets, or Numbers. Every review matrix should have the same first three column headings: (1) authors, title, and journal, (2) publication year, and (3) purpose.

Be aware that it may be difficult to determine purpose from just a cursory review of the article. In some cases, it may be necessary to first read the paper fully to identify its purpose.

Choose your remaining column topics

Next, carefully read all your articles. Note any important issues you identify. The following broad categories provide some suggestions for determining your own subject headings:

Methodological

Methodology is often an important question. For example, if you are looking at tests of an Ebola vaccine beyond human subjects, it will be important to note what type of animal the test was carried out on, i.e. macaques or mice.

Content-specific

Consider noting what was actually studied. For example, when looking at the effectiveness of traditional Chinese medicine in the treatment of illnesses, it would be important to note what illness was being studied.

Geographical

It may be important to note where the research was completed. For example, if you want to compare the effects of the AIDS epidemic in different countries, you would use country as a column heading.

There are many ways to choose your column headings, and these are just a few suggestions. As you create your own matrix, choose column headings that support your research question and goals.

• Do not include column headings that are explicit in your research question. For example, if you are looking at drug use in adolescents, do not include a column heading for age of study participants. If the answer will be the same for every study, it's generally a bad choice for a column heading.
• Do not try to fully complete a review matrix before reading the articles. Reading the articles is an important way to discern the nuances between studies.

Credit: Adapted from David Nolfi, “Matrix Method for Literature Review: The Review Matrix,” Duquesne University, https://guides.library.duq.edu/matrix , 2020.

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Common Assignments: Literature Review Matrix

Literature review matrix.

As you read and evaluate your literature there are several different ways to organize your research. Courtesy of Dr. Gary Burkholder in the School of Psychology, these sample matrices are one option to help organize your articles. These documents allow you to compile details about your sources, such as the foundational theories, methodologies, and conclusions; begin to note similarities among the authors; and retrieve citation information for easy insertion within a document.

You can review the sample matrixes to see a completed form or download the blank matrix for your own use.

• Literature Review Matrix 1 This PDF file provides a sample literature review matrix.
• Literature Review Matrix 2 This PDF file provides a sample literature review matrix.
• Literature Review Matrix Template (Word)
• Literature Review Matrix Template (Excel)

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How to use a concept matrix

For research papers, literature reviews, or longer essays, a concept matrix can be an effective resource in organizing research. A concept matrix is an organizational tool that presents connections between available research articles and specific aspects of a chosen topic by having articles on one side and the specific parts of a topic on the other side. Each cell in the matrix is a visual representation of potential intersections between different parts of the larger topic.

For example, a concept matrix for a literature review on sustainability may look something like this:

How Topics Come Together

For the purposes of this literature review, this concept matrix demonstrates several options for an initial draft. If we wanted to discuss issues of our topic like biodiversity and pollution, for example, we would want to use the articles from Douglas, Yamamoto et al., and Baker and Jackson. However, if we wanted to extend the conversation to include urbanization, our matrix shows us that Douglas may not be an effective option because urbanization is not discussed in his article. A concept matrix also highlights gaps in your research, demonstrating where you may need additional support. Especially for literature reviews, a single source is not enough to substantiate a claim.

How a Concept Matrix Strengthens Synthesis

A concept matrix is helpful to identify opportunities for synthesis , which can be described as the “bigger picture” of your topic revealed by overlapping claims in individual sources. For example, four out of the five articles in the example concept matrix discuss natural resource levels , which indicate this is a critical aspect to discuss.

Even though each of these authors may be discussing natural resource levels , they may not be saying the same things about it. Ochoa and Mayer (1983) may comment that natural resource levels are solely impacted by urbanization , while the research conducted by Baker and Jackson (2015) may indicate that natural resource levels have a significant causal relationship to biodiversity. The overlap here builds a larger picture of how natural resource levels , urbanization, and biodiversity all relate, even though not all of the authors discuss all of these subjects.

Synthesis occurs between these two articles when we can see how they present a bigger picture. Since both of these articles discuss natural resource levels and urbanization , we can think of this as a “conversation starter” where we can ask questions such as:

What do these authors agree on related to these aspects of sustainability?

How do they disagree about these common aspects?

How is it significant that some aspects are discussed in certain articles and not in others?

For example, how is it significant that Baker and Jackson (2015) discuss biodiversity and pollution while Ochoa and Mayer (1983) do not?

Are Baker and Jackson filling in gaps in the previous research conducted by Ochoa and Mayer?

Between the publications of different articles, how has previous research been changed, added to, or disproven by recent literature?

Given that Baker and Jackson’s work is more current than Ochoa and Mayer’s research, how has the earlier discussion about natural resource levels or urbanization changed? What new questions have been raised in the last thirty years?

If the previous research by Ochoa and Mayer was important in the field at the time, do Baker and Jackson reference it or comment on it in their own work?

These are all effective types of questions to ask to work toward synthesis. A concept matrix helps you identify gaps in research and opportunities for synthesis.

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

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

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

What is a literature review? A literature review is a survey of scholarly sources on a specific topic. It provides an overview of current knowledge, allowing you to identify relevant theories, methods, and gaps in the existing research that you can later apply to your paper, thesis, or dissertation topic .

There are five key steps to writing a literature review:

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

A good literature review doesn’t just summarize sources—it analyzes, synthesizes , and critically evaluates to give a clear picture of the state of knowledge on the subject.

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Table of contents

What is the purpose of a literature review, examples of literature reviews, step 1 – search for relevant literature, step 2 – evaluate and select sources, step 3 – identify themes, debates, and gaps, step 4 – outline your literature review’s structure, step 5 – write your literature review, free lecture slides, other interesting articles, frequently asked questions, introduction.

• Quick Run-through
• Step 1 & 2

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

• Demonstrate your familiarity with the topic and its scholarly context
• Develop a theoretical framework and methodology for your research
• Position your work in relation to other researchers and theorists
• Show how your research addresses a gap or contributes to a debate
• Evaluate the current state of research and demonstrate your knowledge of the scholarly debates around your topic.

Writing literature reviews is a particularly important skill if you want to apply for graduate school or pursue a career in research. We’ve written a step-by-step guide that you can follow below.

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

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

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

Download Word doc Download Google doc

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

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

Make a list of keywords

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

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

Search for relevant sources

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

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

You can also use boolean operators to help narrow down your search.

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

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

For each publication, ask yourself:

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

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

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

Take notes and cite your sources

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

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

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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.

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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
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• Stratified sampling
• Cluster sampling
• Likert scales
• Reproducibility

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Research bias

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

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

It is often written as part of a thesis, dissertation , or research paper , in order to situate your work in relation to existing knowledge.

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

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

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

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

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

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

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What is a literature matrix?

As defined by Judith Garrard in her handbook entitled  Health Sciences Literature Reviews Made Easy: The Matrix Method , a “Review of the literature consists of reading, analyzing, and writing a synthesis of scholarly materials about a specific topic. When reviewing scientific literature, the focus is on the hypotheses, the scientific methods, the strengths and weaknesses of the study, the results, and the authors’ interpretations and conclusions.” When reading materials for a literature review, you should critically evaluate the study’s major aims and results. 

The purpose of completing a literature matrix is to help you identify important aspects of the study. Literature matrixes contain a variety of headings, but frequent headings include: author surname and date, theoretical/ conceptual framework, research question(s)/ hypothesis, methodology, analysis & results, conclusions, implications for future research, and implications for practice. You can add additional columns as needed, and you might consider adding a “notes column” to proactively have important quotations and your thoughts already collected.  As you read journal articles, have your literature matrix ready. It is best to fill in the matrix directly after reading a work, rather than returning to the matrix later.  

Literature Matrix Files

You should use a literature matrix that best helps you to organize your reading and research. Excel workbooks can help to organize your research. Sample basic and complex literature matrixes are provided below: 

• Literature Matrix Basic BLANK
• Literature Matrix Basic SAMPLE
• Literature Matrix Complex BLANK

Synthesize vs. Summarize

When writing your literature review, you will not simply summarize the materials that you found related to your topic. A summary is a recap of the information provided in research articles. Summaries provide basic information about the study, but the details provided in a summary are not enumerative or systematic. 

Synthesizing goes beyond summarizing to explore specific aspects of the research study. When synthesizing the literature, rely on your completed literature matrix to inform your writing. Do you see any tends across publications? Was one type of methodology used repeatedly, why or why not? Did separate teams of researchers come to the same conclusion, differing conclusions, or is the literature inconclusive? Synthesizing requires that you look at the current state of the research overall. 

When preparing to write a synthesis, you will read the literature available, tease apart individual findings and supporting evidence across different articles, and then reorganize this information in a way that presents your understanding of the current state of research in this field.  

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How to use a concept matrix

For research papers, literature reviews, or longer essays, a concept matrix can be an effective resource in organizing research. A concept matrix is an organizational tool that presents connections between available research articles and specific aspects of a chosen topic by having articles on one side and the specific parts of a topic on the other side. Each cell in the matrix is a visual representation of potential intersections between different parts of the larger topic.

For example, a concept matrix for a literature review on sustainability may look something like this:

How Topics Come Together

For the purposes of this literature review, this concept matrix demonstrates several options for an initial draft. If we wanted to discuss issues of our topic like biodiversity and pollution, for example, we would want to use the articles from Douglas, Yamamoto et al., and Baker and Jackson. However, if we wanted to extend the conversation to include urbanization, our matrix shows us that Douglas may not be an effective option because urbanization is not discussed in his article. A concept matrix also highlights gaps in your research, demonstrating where you may need additional support. Especially for literature reviews, a single source is not enough to substantiate a claim.

How a Concept Matrix Strengthens Synthesis

A concept matrix is helpful to identify opportunities for synthesis , which can be described as the “bigger picture” of your topic revealed by overlapping claims in individual sources. For example, four out of the five articles in the example concept matrix discuss natural resource levels , which indicate this is a critical aspect to discuss.

Even though each of these authors may be discussing natural resource levels , they may not be saying the same things about it. Ochoa and Mayer (1983) may comment that natural resource levels are solely impacted by urbanization , while the research conducted by Baker and Jackson (2015) may indicate that natural resource levels have a significant causal relationship to biodiversity. The overlap here builds a larger picture of how natural resource levels , urbanization, and biodiversity all relate, even though not all of the authors discuss all of these subjects.

Synthesis occurs between these two articles when we can see how they present a bigger picture. Since both of these articles discuss natural resource levels and urbanization , we can think of this as a “conversation starter” where we can ask questions such as:

What do these authors agree on related to these aspects of sustainability?

How do they disagree about these common aspects?

How is it significant that some aspects are discussed in certain articles and not in others?

For example, how is it significant that Baker and Jackson (2015) discuss biodiversity and pollution while Ochoa and Mayer (1983) do not?

Are Baker and Jackson filling in gaps in the previous research conducted by Ochoa and Mayer?

Between the publications of different articles, how has previous research been changed, added to, or disproven by recent literature?

Given that Baker and Jackson’s work is more current than Ochoa and Mayer’s research, how has the earlier discussion about natural resource levels or urbanization changed? What new questions have been raised in the last thirty years?

If the previous research by Ochoa and Mayer was important in the field at the time, do Baker and Jackson reference it or comment on it in their own work?

These are all effective types of questions to ask to work toward synthesis. A concept matrix helps you identify gaps in research and opportunities for synthesis.

Module 4: Strategic Reading

Organize your Readings with a Literature Review Matrix

The next step after reading and evaluating your sources is to organize them in a way that will help you start the writing process.

Review Matrix

One way to organize your literature is with a review matrix. The review matrix is a chart that sorts and categorizes the different arguments presented per topic or issue. Using a matrix enables you to quickly compare and contrast your sources in order to determine the scope of research across time. This will allow you  to spot similarities and differences between sources. It is particularly useful in the synthesis and analysis stages of a review (See Module 1 Conducting a Literature Review with the SALSA Framework ).

Example of a Review Matrix

My research question:

How can we use machine learning to analyze social media data related to HIV?

Writing a Literature Review Modified from The WI+RE Team,  UCLA. Creative Commons CC-BY-NA-SA

Create a Review Matrix

Start with a charting tool you are most familiar with (for example MS Word, MS Excel, Google Sheets, Numbers etc).

• Organize your sources from oldest to most recent. This way you can see how the research on your topic has changed over time.
• First Column: citation (i.e., author, title, source, publication year)
• Second Column: purpose or summary (1-2 sentences)
• methodology
• intervention

Key Takeaways

Here are some examples of different review matrices and templates:

• Evidence Synthesis Matrix Template, Jane Schmidt, Toronto Metropolitan University (Google Sheets)
• The Matrix Method for Literature Reviews, Brandeis University, Writing Resources.
• Literature Review Synthesis Matrix , Concordia University (MS Word)
• Write a Literature Review: Synthesize . Johns Hopkins University, Sheridan Libraries

Advanced Research Skills: Conducting Literature and Systematic Reviews (2nd Edition) Copyright © 2021 by Kelly Dermody; Cecile Farnum; Daniel Jakubek; Jo-Anne Petropoulos; Jane Schmidt; and Reece Steinberg is licensed under a Creative Commons Attribution 4.0 International License , except where otherwise noted.

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What is a Systematic Literature Review?

A systematic literature review (SLR) is an independent academic method that aims to identify and evaluate all relevant literature on a topic in order to derive conclusions about the question under consideration. "Systematic reviews are undertaken to clarify the state of existing research and the implications that should be drawn from this." (Feak & Swales, 2009, p. 3) An SLR can demonstrate the current state of research on a topic, while identifying gaps and areas requiring further research with regard to a given research question. A formal methodological approach is pursued in order to reduce distortions caused by an overly restrictive selection of the available literature and to increase the reliability of the literature selected (Tranfield, Denyer & Smart, 2003). A special aspect in this regard is the fact that a research objective is defined for the search itself and the criteria for determining what is to be included and excluded are defined prior to conducting the search. The search is mainly performed in electronic literature databases (such as Business Source Complete or Web of Science), but also includes manual searches (reviews of reference lists in relevant sources) and the identification of literature not yet published in order to obtain a comprehensive overview of a research topic.

An SLR protocol documents all the information gathered and the steps taken as part of an SLR in order to make the selection process transparent and reproducible. The PRISMA flow-diagram support you in making the selection process visible.

In an ideal scenario, experts from the respective research discipline, as well as experts working in the relevant field and in libraries, should be involved in setting the search terms . As a rule, the literature is selected by two or more reviewers working independently of one another. Both measures serve the purpose of increasing the objectivity of the literature selection. An SLR must, then, be more than merely a summary of a topic (Briner & Denyer, 2012). As such, it also distinguishes itself from “ordinary” surveys of the available literature. The following table shows the differences between an SLR and an “ordinary” literature review.

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Differences to "common" literature reviews

What are the objectives of slrs.

• Avoidance of research redundancies despite a growing amount of publications
• Identification of research areas, gaps and methods
• Input for evidence-based management, which allows to base management decisions on scientific methods and findings
• Identification of links between different areas of researc

Process steps of an SLR

A SLR has several process steps which are defined differently in the literature (Fink 2014, p. 4; Guba 2008, Transfield et al. 2003). We distinguish the following steps which are adapted to the economics and management research area:

1. Defining research questions

Briner & Denyer (2009, p. 347ff.) have developed the CIMO scheme to establish clearly formulated and answerable research questions in the field of economic sciences:

C – CONTEXT:  Which individuals, relationships, institutional frameworks and systems are being investigated?

I – Intervention:  The effects of which event, action or activity are being investigated?

M – Mechanisms:  Which mechanisms can explain the relationship between interventions and results? Under what conditions do these mechanisms take effect?

O – Outcomes:  What are the effects of the intervention? How are the results measured? What are intended and unintended effects?

The objective of the systematic literature review is used to formulate research questions such as “How can a project team be led effectively?”. Since there are numerous interpretations and constructs for “effective”, “leadership” and “project team”, these terms must be particularized.

With the aid of the scheme, the following concrete research questions can be derived with regard to this example:

Under what conditions (C) does leadership style (I) influence the performance of project teams (O)?

Which constructs have an effect upon the influence of leadership style (I) on a project team’s performance (O)?          

Research questions do not necessarily need to follow the CIMO scheme, but they should:

• ... be formulated in a clear, focused and comprehensible manner and be answerable;
• ... have been determined prior to carrying out the SLR;
• ... consist of general and specific questions.

As early as this stage, the criteria for inclusion and exclusion are also defined. The selection of the criteria must be well-grounded. This may include conceptual factors such as a geographical or temporal restrictions, congruent definitions of constructs, as well as quality criteria (journal impact factor > x).

2. Selecting databases and other research sources

The selection of sources must be described and explained in detail. The aim is to find a balance between the relevance of the sources (content-related fit) and the scope of the sources.

In the field of economic sciences, there are a number of literature databases that can be searched as part of an SLR. Some examples in this regard are:

• Business Source Complete
• ProQuest One Business
• Web of Science
• EconBiz        

Our video " Selecting the right databases " explains how to find relevant databases for your topic.

Literature databases are an important source of research for SLRs, as they can minimize distortions caused by an individual literature selection (selection bias), while offering advantages for a systematic search due to their data structure. The aim is to find all database entries on a topic and thus keep the retrieval bias low (tutorial on retrieval bias ).  Besides articles from scientific journals, it is important to inlcude working papers, conference proceedings, etc to reduce the publication bias ( tutorial on publication bias ).

Our online self-study course " Searching economic databases " explains step 2 und 3.

3. Defining search terms

Once the literature databases and other research sources have been selected, search terms are defined. For this purpose, the research topic/questions is/are divided into blocks of terms of equal ranking. This approach is called the block-building method (Guba 2008, p. 63). The so-called document-term matrix, which lists topic blocks and search terms according to a scheme, is helpful in this regard. The aim is to identify as many different synonyms as possible for the partial terms. A precisely formulated research question facilitates the identification of relevant search terms. In addition, keywords from particularly relevant articles support the formulation of search terms.

A document-term matrix for the topic “The influence of management style on the performance of project teams” is shown in this example .

Identification of headwords and keywords

When setting search terms, a distinction must be made between subject headings and keywords, both of which are described below:

• appear in the title, abstract and/or text
• sometimes specified by the author, but in most cases automatically generated
• non-standardized
• different spellings and forms (singular/plural) must be searched separately

Subject headings

• describe the content
• are generated by an editorial team
• are listed in a standardized list (thesaurus)
• may comprise various keywords
• include different spellings
• database-specific

Subject headings are a standardized list of words that are generated by the specialists in charge of some databases. This so-called index of subject headings (thesaurus) helps searchers find relevant articles, since the headwords indicate the content of a publication. By contrast, an ordinary keyword search does not necessarily result in a content-related fit, since the database also displays articles in which, for example, a word appears once in the abstract, even though the article’s content does not cover the topic.

Nevertheless, searches using both headwords and keywords should be conducted, since some articles may not yet have been assigned headwords, or errors may have occurred during the assignment of headwords. 

To add headwords to your search in the Business Source Complete database, please select the Thesaurus tab at the top. Here you can find headwords in a new search field and integrate them into your search query. In the search history, headwords are marked with the addition DE (descriptor).

The EconBiz database of the German National Library of Economics (ZBW – Leibniz Information Centre for Economics), which also contains German-language literature, has created its own index of subject headings with the STW Thesaurus for Economics . Headwords are integrated into the search by being used in the search query.

Since the indexes of subject headings divide terms into synonyms, generic terms and sub-aspects, they facilitate the creation of a document-term matrix. For this purpose it is advisable to specify in the document-term matrix the origin of the search terms (STW Thesaurus for Economics, Business Source Complete, etc.).

Searching in literature databases

Once the document-term matrix has been defined, the search in literature databases begins. It is recommended to enter each word of the document-term matrix individually into the database in order to obtain a good overview of the number of hits per word. Finally, all the words contained in a block of terms are linked with the Boolean operator OR and thereby a union of all the words is formed. The latter are then linked with each other using the Boolean operator AND. In doing so, each block should be added individually in order to see to what degree the number of hits decreases.

Since the search query must be set up separately for each database, tools such as  LitSonar  have been developed to enable a systematic search across different databases. LitSonar was created by  Professor Dr. Ali Sunyaev (Institute of Applied Informatics and Formal Description Methods – AIFB) at the Karlsruhe Institute of Technology.

Advanced search

Certain database-specific commands can be used to refine a search, for example, by taking variable word endings into account (*) or specifying the distance between two words, etc. Our overview shows the most important search commands for our top databases.

Additional searches in sources other than literature databases

In addition to literature databases, other sources should also be searched. Fink (2014, p. 27) lists the following reasons for this:

• the topic is new and not yet included in indexes of subject headings;
• search terms are not used congruently in articles because uniform definitions do not exist;
• some studies are still in the process of being published, or have been completed, but not published.

Therefore, further search strategies are manual search, bibliographic analysis, personal contacts and academic networks (Briner & Denyer, p. 349). Manual search means that you go through the source information of relevant articles and supplement your hit list accordingly. In addition, you should conduct a targeted search for so-called gray literature, that is, literature not distributed via the book trade, such as working papers from specialist areas and conference reports. By including different types of publications, the so-called publication bias (DBWM video “Understanding publication bias” ) – that is, distortions due to exclusive use of articles from peer-reviewed journals – should be kept to a minimum.

The PRESS-Checklist can support you to check the correctness of your search terms.

4. Merging hits from different databases

In principle, large amounts of data can be easily collected, structured and sorted with data processing programs such as Excel. Another option is to use literature management programs such as EndNote, Citavi or Zotero. The Saxon State and University Library Dresden (SLUB Dresden) provides an  overview of current literature management programs  . Software for qualitative data analysis such as NVivo is equally suited for data processing. A comprehensive overview of the features of different tools that support the SLR process can be found in Bandara et al. (2015).

Our online-self study course "Managing literature with Citavi" shows you how to use the reference management software Citavi.

When conducting an SLR, you should specify for each hit the database from which it originates and the date on which the query was made. In addition, you should always indicate how many hits you have identified in the various databases or, for example, by manual search.

Exporting data from literature databases

Exporting from literature databases is very easy. In  Business Source Complete  , you must first click on the “Share” button in the hit list, then “Email a link to download exported results” at the very bottom and then select the appropriate format for the respective literature program.

In the  Web of Science  database, you must select “Export” and select the relevant format. Tip: You can adjust the extracted data fields. Since for example the abstract is not automatically exported, decide which data fields are of interest for you.

Exporting data from the literature database  EconBiz  is somewhat more complex. Here you must first create a marked list and then select each hit individually and add it to the marked list. Afterwards, articles on the list can be exported.

After merging all hits from the various databases, duplicate entries (duplicates) are deleted.

5. Applying inclusion and exclusion criteria

All publications are evaluated in the literature management program applying the previously defined criteria for inclusion and exclusion. Only those sources that survive this selection process will subsequently be analyzed. The review process and inclusion criteria should be tested with a small sample and adjustments made if necessary before applying it to all articles. In the ideal case, even this selection would be carried out by more than one person, with each working independently of one another. It needs to be made clear how discrepancies between reviewers are dealt with. 

The review of the criteria for inclusion and exclusion is primarily based on the title, abstract and subject headings in the databases, as well as on the keywords provided by the authors of a publication in the first step. In a second step the whole article / source will be read.

Within the Citavi literature-management program, you can supplement title data by adding your own fields. In this regard, the criteria for inclusion can be listed individually and marked with 0 in the free text field for being “not fulfilled” and with 1 for being “fulfilled”. In the table view of all titles, you can use the column function to select which columns should be displayed. Here you can include the criteria for inclusion. By exporting the title list to Excel, it is easy to calculate how many titles remain when applying the criteria for inclusion and exclusion.

In addition to the common literature management tools, you can also use software tools that have been developed to support SLRs. The central library of the university in Zurich has published an overview and evaluation of different tools based on a survey among researchers. --> View SLR tools

The selection process needs to be made transparent. The PRISMA flow diagram supports the visualization of the number of included / excluded studies.

Forward and backward search

Should it become apparent that the number of sources found is relatively small, or if you wish to proceed with particular thoroughness, a forward-and-backward search based on the sources found is recommendable (Webster & Watson 2002, p. xvi). A backward search means going through the bibliographies of the sources found. A forward search, by contrast, identifies articles that have cited the relevant publications. The Web of Science and Scopus databases can be used to perform citation analyses.

6. Perform the review

As the next step, the remaining titles are analyzed as to their content by reading them several times in full. Information is extracted according to defined criteria and the quality of the publications is evaluated. If the data extraction is carried out by more than one person, a training ensures that there will be no differences between the reviewers.

Depending on the research questions there exist diffent methods for data abstraction (content analysis, concept matrix etc.). A so-called concept matrix can be used to structure the content of information (Webster & Watson 2002, p. xvii). The image to the right gives an example of a concept matrix according to Becker (2014).

Particularly in the field of economic sciences, the evaluation of a study’s quality cannot be performed according to a generally valid scheme, such as those existing in the field of medicine, for instance. Quality assessment therefore depends largely on the research questions.

Based on the findings of individual studies, a meta-level is then applied to try to understand what similarities and differences exist between the publications, what research gaps exist, etc. This may also result in the development of a theoretical model or reference framework.

Example concept matrix (Becker 2013) on the topic Business Process Management

7. synthesizing results.

Once the review has been conducted, the results must be compiled and, on the basis of these, conclusions derived with regard to the research question (Fink 2014, p. 199ff.). This includes, for example, the following aspects:

• historical development of topics (histogram, time series: when, and how frequently, did publications on the research topic appear?);
• overview of journals, authors or specialist disciplines dealing with the topic;
• comparison of applied statistical methods;
• topics covered by research;
• identifying research gaps;
• developing a reference framework;
• developing constructs;
• performing a meta-analysis: comparison of the correlations of the results of different empirical studies (see for example Fink 2014, p. 203 on conducting meta-analyses)

Publications about the method

Bandara, W., Furtmueller, E., Miskon, S., Gorbacheva, E., & Beekhuyzen, J. (2015). Achieving Rigor in Literature Reviews: Insights from Qualitative Data Analysis and Tool-Support.  Communications of the Association for Information Systems . 34(8), 154-204.

Booth, A., Papaioannou, D., and Sutton, A. (2012)  Systematic approaches to a successful literature review.  London: Sage.

Briner, R. B., & Denyer, D. (2012). Systematic Review and Evidence Synthesis as a Practice and Scholarship Tool. In Rousseau, D. M. (Hrsg.),  The Oxford Handbook of Evidenence Based Management . (S. 112-129). Oxford: Oxford University Press.

Durach, C. F., Wieland, A., & Machuca, Jose A. D. (2015). Antecedents and dimensions of supply chain robustness: a systematic literature review . International Journal of Physical Distribution & Logistic Management , 46 (1/2), 118-137. doi:  https://doi.org/10.1108/IJPDLM-05-2013-0133

Feak, C. B., & Swales, J. M. (2009). Telling a Research Story: Writing a Literature Review.  English in Today's Research World 2.  Ann Arbor: University of Michigan Press. doi:  10.3998/mpub.309338

Fink, A. (2014).  Conducting Research Literature Reviews: From the Internet to Paper  (4. Aufl.). Los Angeles, London, New Delhi, Singapore, Washington DC: Sage Publication.

Fisch, C., & Block, J. (2018). Six tips for your (systematic) literature review in business and management research.  Management Review Quarterly,  68, 103–106 (2018).  doi.org/10.1007/s11301-018-0142-x

Guba, B. (2008). Systematische Literaturrecherche.  Wiener Medizinische Wochenschrift , 158 (1-2), S. 62-69. doi:  doi.org/10.1007/s10354-007-0500-0  Hart, C.  Doing a literature review: releasing the social science research imagination.  London: Sage.

Jesson, J. K., Metheson, L. & Lacey, F. (2011).  Doing your Literature Review - traditional and Systematic Techniques . Los Angeles, London, New Delhi, Singapore, Washington DC: Sage Publication.

Page MJ, McKenzie JE, Bossuyt PM, Boutron I, Hoffmann TC, Mulrow CD, et al. The PRISMA 2020 statement: an updated guideline for reporting systematic reviews. BMJ 2021;372:n71. doi: 10.1136/bmj.n71.

Petticrew, M. and Roberts, H. (2006).  Systematic Reviews in the Social Sciences: A Practical Guide . Oxford:Blackwell. Ridley, D. (2012).  The literature review: A step-by-step guide . 2nd edn. London: Sage. 

Chang, W. and Taylor, S.A. (2016), The Effectiveness of Customer Participation in New Product Development: A Meta-Analysis,  Journal of Marketing , American Marketing Association, Los Angeles, CA, Vol. 80 No. 1, pp. 47–64.

Tranfield, D., Denyer, D. & Smart, P. (2003). Towards a methodology for developing evidence-informed management knowledge by means of systematic review.  British Journal of Management , 14 (3), S. 207-222. doi:  https://doi.org/10.1111/1467-8551.00375

Webster, J., & Watson, R. T. (2002). Analyzing the Past to Prepare for the Future: Writing a Literature Review.  Management Information Systems Quarterly , 26(2), xiii-xxiii.  http://www.jstor.org/stable/4132319

Durach, C. F., Wieland, A. & Machuca, Jose. A. D. (2015). Antecedents and dimensions of supply chain robustness: a systematic literature review. International Journal of Physical Distribution & Logistics Management, 45(1/2), 118 – 137.

What is particularly good about this example is that search terms were defined by a number of experts and the review was conducted by three researchers working independently of one another. Furthermore, the search terms used have been very well extracted and the procedure of the literature selection very well described.

On the downside, the restriction to English-language literature brings the language bias into play, even though the authors consider it to be insignificant for the subject area.

Bos-Nehles, A., Renkema, M. & Janssen, M. (2017). HRM and innovative work behaviour: a systematic literature review. Personnel Review, 46(7), pp. 1228-1253

• Only very specific keywords used
• No precise information on how the review process was carried out (who reviewed articles?)
• Only journals with impact factor (publication bias)

Jia, F., Orzes, G., Sartor, M. & Nassimbeni, G. (2017). Global sourcing strategy and structure: towards a conceptual framework. International Journal of Operations & Production Management, 37(7), 840-864

• Research questions are explicitly presented
• Search string very detailed
• Exact description of the review process
• 2 persons conducted the review independently of each other

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East Carolina University: RN to BSN Library Research Guide: Literature Review Matrix

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Nursing Literature Reviews

What is a Literature (Lit) Review? 

A Literature Review is Not: 

• a quick summary of sources
• a grouping of broad, unrelated sources
• a compilation of everything that has ever been written on a topic
• a literature criticism or book review

So, what is it then?

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

Adapted from:  https://libguides.uwf.edu/c.php?g=215270&p=4439026  by Hillary Fox, University of West Florida,  hfox @uwf.edu.

Creating a Literature Review using the Matrix Method: 

A matrix review allows you to quickly compare and contrast articles in an easy to read format. It can help you to easily spot differences and similarities between journal articles and your nursing research topic. Review matrices are especially helpful for health sciences literature reviews that cover the scope of research over a given amount of time. 

Most literature reviews are set up in this format: 

Chart adapted from the book below: 

• Check out the e-book above for more help in creating a literature review matrix. 

Steps for Conducting a Literature Review

1. Choose Your Topic

• Review your PICO question and think about your central research question. To review the PICO process, please see Kerry Sewell's LibGuide on this subject. 

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? 

3. Select the databases you want to use to conduct your searches (See the Databases Tab Above!)

4. Conduct your searches and find the literature. (Keep track of your searches, try using the Search Strategy Lab Notebook!)

• Review the abstracts and conclusions carefully. This will help you decide which articles actually fit the criteria you are looking for. 
• Write down the keywords you used and where you found them. 
• You can also use RefWorks to keep track of your citations. 

5. Review the Literature (This will probably be the most time consuming part)

• What was the research question of the study you are reviewing?  What were the authors trying to discover? 
• Was the research funded by a company or source that could influence the findings? (Such as Colgate® sponsoring a toothpaste study?)
• What were the research methodologies? Analyze the paper's literature review, the samples and variables used, the results and conclusions. Does the research seem to be complete? Could it have been conducted more soundly? What questions does it raise? 
• If there are conflicting studies, why do you think that is? 
• How are the authors of the paper viewed in the field? Has this study been cited by other publications? 

Literature Review Examples

Remember, a lit review provides an intelligent overview of the topic. There may or may not be a method for how studies are collected or interpreted. Lit reviews aren't always labeled specifically as "literature reviews," they may often be embedded with other sections such as an introduction or background. 

• Mentes, J.C., Salem, N., & Phillips, L.R. (2017). Ethnocultural gerontological nursing. An integrative literature review. Journal of Transcultural Nursing, 28(1), 79-97.  https://journals.sagepub.com/doi/pdf/10.1177/1043659615601483
• Rosa, D.F., Carvalho, M.V., & Pereira, N.R, et al. (2019). Nursing care for the transgender population: genders from the perspective of professional practice. Revista Brasilerira de Enfermagem, 72 (Suppl 1), 299-306.  http://www.scielo.br/pdf/reben/v72s1/0034-7167-reben-72-s1-0299.pdf
• Dahlke, S.A., Hunter, K.F., Negrin, K. (2019). Nursing practice with hospitalized older people: Safety and harm. International Journal of Older People Nursing, 14 (1), Article e1220.  https://onlinelibrary.wiley.com/doi/full/10.1111/opn.12220

Adapted from:  https://libguides.uwf.edu/c.php?g=215270&p=4439026  by Hillary Fox, University of West Florida, [email protected].

Carrie Forbes, MLS

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Matrix Method for Literature Review

• The Review Matrix

Organize Your Sources

• Choose Your Remaining Column Topics
• More Information
• Sample Matrix and Templates
• Related Library Guides
• Getting Help

Once you complete your research, organize your source by date in order to make it easier to see changes in research over time.

Every review matrix should have the same first three column headings: (1) authors, title, and journal, (2) publication year, and (3) purpose.

It may be difficult to determine purpose from just a cursory review of the article. In some cases, it may be necessary to first read the paper fully to identify its purpose.

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Search catalog, soc 303: introduction to research methods(orend): literature matrix.

• Literature Searching
• Research Question
• Annotated Bibliography
• Writing a Literature Review
• Literature Matrix
• Evaluating Sources
• Citing Souces

Literature Review Matrix: Section One

This section helps you analyze each individual article for its research question(s), method(s), results, and conclusions. It also enables you to evaluate it for its strengths and limitations and identify its themes before you attempt to connect it to other research.

Literature Matrix 2

This part helps you visually connect the themes and identify disparate themes so that you can begin to synthesize established knowledge on your topic and identify alternative points of view on the topic and speak to why those might exist.

Organize Your Articles

A literature review matrix serves to help you visually organize your thoughts on an article.

This is only one option of many that can help you organize your thoughts; you can easily change the first section to reflect your discipline

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• Research Guides

Literature Review: A Self-Guided Tutorial

Using a synthesis matrix.

• Literature Reviews: A Recap
• Peer Review
• Reading the Literature
• Using Concept Maps
• Developing Research Questions
• Considering Strong Opinions
• 2. Review discipline styles
• Super Searching
• Finding the Full Text
• Citation Searching This link opens in a new window
• When to stop searching
• Citation Management
• Annotating Articles Tip
• 5. Critically analyze and evaluate
• How to Review the Literature
• 7. Write literature review

A synthesis matrix visually represents your research by organizing your sources by themes:

• Sample Synthesis Matrix Example provided by Ashford University Writing Center .
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