What is a literature review?
A literature review is a critical analysis of published sources, or literature, on a particular topic. It is an assessment of the literature and provides a summary, classification, comparison and evaluation. At postgraduate level literature reviews can be incorporated into an article, a research report or thesis. At undergraduate level literature reviews can be a separate stand alone assessment.
The literature review is generally in the format of a standard essay made up of three components: an introduction, a body and a conclusion. It is not a list like an annotated bibliography in which a summary of each source is listed one by one.
Why do we write literature reviews?
At university you may be asked to write a literature review in order to demonstrate your understanding of the literature on a particular topic. You show your understanding by analysing and then synthesising the information to:
- Determine what has already been written on a topic
- Provide an overview of key concepts
- Identify major relationships or patterns
- Identify strengths and weaknesses
- Identify any gaps in the research
- Identify any conflicting evidence
- Provide a solid background to a research paper’s investigation
How to write a literature review
Determine your purpose
Work out what you need to address in the literature review. What are you being asked to do in your literature review? What are you searching the literature to discover? Check your assignment question and your criteria sheet to know what to focus on.
Do an extensive search of the literature
Find out what has been written on the topic.
What kind of literature?
Select appropriate source material: Use a variety of academic or scholarly sources that are relevant, current and authoritative. An extensive review of relevant material will include — books, journal articles, reports, government documents, conference proceedings and web resources. The Library would be the best place to search for your sources.
How many resources?
The number of sources that you will be required to review will depend on what the literature review is for and how advanced you are in your studies. It could be from five sources at first year undergraduate level to more than fifty for a thesis. Your lecturer will advise you on these details.
Note the bibliographical details of your sources
Keep a note of the publication title, date, authors’ names, page numbers and publishers. These details will save you time later.
Read the literature
- Critically read each source, look for the arguments presented rather than for facts.
- Take notes as you read and start to organise your review around themes and ideas.
- Consider using a table, matrix or concept map to identify how the different sources relate to each other.
Analyse the literature you have found
In order for your writing to reflect strong critical analysis, you need to evaluate the sources. For each source you are reviewing ask yourself these questions:
- What are the key terms and concepts?
- How relevant is this article to my specific topic?
- What are the major relationships, trends and patterns?
- How has the author structured the arguments?
- How authoritative and credible is this source?
- What are the differences and similarities between the sources?
- Are there any gaps in the literature that require further study?
Write the review
- Start by writing your thesis statement. This is an important introductory sentence that will tell your reader what the topic is and the overall perspective or argument you will be presenting.
- Like essays, a literature review must have an introduction, a body and a conclusion.
Structure of a literature review
Your introduction should give an outline of
- why you are writing a review, and why the topic is important
- the scope of the review — what aspects of the topic will be discussed
- the criteria used for your literature selection (e.g.. type of sources used, date range)
- the organisational pattern of the review.
Each body paragraph should deal with a different theme that is relevant to your topic. You will need to synthesise several of your reviewed readings into each paragraph, so that there is a clear connection between the various sources. You will need to critically analyse each source for how they contribute to the themes you are researching.
The body could include paragraphs on:
- historical background
- previous studies on the topic
- mainstream versus alternative viewpoints
- principal questions being asked
- general conclusions that are being drawn.
Your conclusion should give a summary of:
- the main agreements and disagreements in the literature
- any gaps or areas for further research
- your overall perspective on the topic.
Checklist for a literature review
- outlined the purpose and scope?
- identified appropriate and credible (academic/scholarly) literature?
- recorded the bibliographical details of the sources?
- analysed and critiqued your readings?
- identified gaps in the literature and research?
- explored methodologies / theories / hypotheses / models?
- discussed the varying viewpoints?
- written an introduction, body and conclusion?
- checked punctuation and spelling?
A literature review is both a summary and explanation of the complete and current state of knowledge on a limited topic as found in academic books and journal articles. There are two kinds of literature reviews you might write at university: one that students are asked to write as a stand-alone assignment in a course, often as part of their training in the research processes in their ﬁeld, and the other that is written as part of an introduction to, or preparation for, a longer work, usually a thesis or research report. The focus and perspective of your review and the kind of hypothesis or thesis argument you make will be determined by what kind of review you are writing. One way to understand the differences between these two types is to read published literature reviews or the ﬁrst chapters of theses and dissertations in your own subject area. Analyse the structure of their arguments and note the way they address the issues.
Purpose of the Literature Review
- It gives readers easy access to research on a particular topic by selecting high quality articles or studies that are relevant, meaningful, important and valid and summarizing them into one complete report
- It provides an excellent starting point for researchers beginning to do research in a new area by forcing them to summarize, evaluate, and compare original research in that speciﬁc area
- It ensures that researchers do not duplicate work that has already been done
- It can provide clues as to where future research is heading or recommend areas on which to focus
- It highlights key ﬁndings
- It identiﬁes inconsistencies, gaps and contradictions in the literature
- It provides a constructive analysis of the methodologies and approaches of other researchers
Content of the Review
The introduction explains the focus and establishes the importance of the subject. It discusses what kind of work has been done on the topic and identiﬁes any controversies within the ﬁeld or any recent research which has raised questions about earlier assumptions. It may provide background or history. It concludes with a purpose or thesis statement. In a stand-alone literature review, this statement will sum up and evaluate the state of the art in this ﬁeld of research; in a review that is an introduction or preparatory to a thesis or research report, it will suggest how the review ﬁndings will lead to the research the writer proposes to undertake.
Often divided by headings/subheadings, the body summarizes and evaluates the current state of knowledge in the ﬁeld. It notes major themes or topics, the most important trends, and any ﬁndings about which researchers agree or disagree. If the review is preliminary to your own thesis or research project, its purpose is to make an argument that will justify your proposed research. Therefore, it will discuss only that research which leads directly to your own project.
The conclusion summarizes all the evidence presented and shows its signiﬁcance. If the review is an introduction to your own research, it highlights gaps and indicates how previous research leads to your own research project and chosen methodology. If the review is a stand-alone assignment for a course, it should suggest any practical applications of the research as well as the implications and possibilities for future research.
Nine Steps To Writing A Literature Review
1. Find a Working Topic
Look at your speciﬁc area of study. Think about what interests you, and what is fertile ground for study. Talk to your professor, brainstorm, and read lecture notes and recent issues of periodicals in the ﬁeld.
2. Review the Literature
- Using keywords, search a computer database. It is best to use at least two databases relevant to your discipline
- Remember that the reference lists of recent articles and reviews can lead to valuable papers
- Make certain that you also include any studies contrary to your point of view
3. Focus Your Topic Narrowly and Select Papers Accordingly
Consider the following:
- What interests you?
- What interests others?
- What time span of research will you consider?
Choose an area of research that is due for a review.
4. Read the Selected Articles Thoroughly and Evaluate Them
- What assumptions do most/some researchers seem to be making?
- What methodologies do they use? what testing procedures, subjects, material tested?
- Evaluate and synthesize the research ﬁndings and conclusions drawn
- Note experts in the ﬁeld: names/labs that are frequently referenced
- Note conﬂicting theories, results, methodologies
- Watch for popularity of theories and how this has/has not changed over time
5. Organize the Selected Papers By Looking For Patterns and By Developing Subtopics
Note things such as:
- Findings that are common/contested
- Two or three important trends in the research
- The most inﬂuential theories
6. Develop a Working Thesis
Write a one or two sentence statement summarizing the conclusion you have reached about the major trends and developments you see in the research that has been done on your subject.
7. Organize Your Own Paper Based on the Findings From Steps 4 & 5
Develop headings/subheadings. If your literature review is extensive, ﬁnd a large table surface, and on it place post-it notes or ﬁling cards to organize all your ﬁndings into categories. Move them around if you decide that (a) they ﬁt better under different headings, or (b) you need to establish new topic headings.
8. Write the Body of the Paper
Follow the plan you have developed above, making certain that each section links logically to the one before and after, and that you have divided your sections by themes or subtopics, not by reporting the work of individual theorists or researchers.
9. Look At What You Have Written; Focus On Analysis, Not Description
Look at the topic sentences of each paragraph. If you were to read only these sentences, would you ﬁnd that your paper presented a clear position, logically developed, from beginning to end? If, for example, you ﬁnd that each paragraph begins with a researcher's name, it might indicate that, instead of evaluating and comparing the research literature from an analytical point of view, you have simply described what research has been done. This is one of the most common problems with student literature reviews. So if your paper still does not appear to be deﬁned by a central, guiding concept, or if it does not critically analyse the literature selected, then you should make a new outline based on what you have said in each section and paragraph of the paper, and decide whether you need to add information, to delete off-topic information, or to restructure the paper entirely.
For example, look at the following two passages and note that Student A is merely describing the literature and Student B takes a more analytical and evaluative approach, by comparing and contrasting. You can also see that this evaluative approach is well signalled by linguistic markers indicating logical connections (words such as "however," "moreover") and phrases such as "substantiates the claim that," which indicate supporting evidence and Student B's ability to synthesize knowledge.
Smith (2000) concludes that personal privacy in their living quarters is the most important factor in nursing home residents' perception of their autonomy. He suggests that the physical environment in the more public spaces of the building did not have much impact on their perceptions. Neither the layout of the building, nor the activities available seem to make much difference. Jones and Johnstone make the claim that the need to control one's environment is a fundamental need of life (2001), and suggest that the approach of most institutions, which is to provide total care, may be as bad as no care at all. If people have no choices or think that they have none, they become depressed.
After studying residents and staff from two intermediate care facilities in Calgary, Alberta, Smith (2000) came to the conclusion that except for the amount of personal privacy available to residents, the physical environment of these institutions had minimal if any effect on their perceptions of control (autonomy). However, French (1998) and Haroon (2000) found that availability of private areas is not the only aspect of the physical environment that determines residents' autonomy. Haroon interviewed 115 residents from 32 different nursing homes known to have different levels of autonomy (2000). It was found that physical structures, such as standardized furniture, heating that could not be individually regulated, and no possession of a house key for residents limited their feelings of independence. Moreover, Hope (2002), who interviewed 225 residents from various nursing homes, substantiates the claim that characteristics of the institutional environment such as the extent of resources in the facility, as well as its location, are features which residents have indicated as being of great importance to their independence.
Finishing Touches: Revising and Editing Your Work
- Read your work out loud. That way you will be better able to identify where you need punctuation marks to signal pauses or divisions within sentences, where you have made grammatical errors, or where your sentences are unclear
- Since the purpose of a literature review is to demonstrate that the writer is familiar with the important professional literature on the chosen subject, check to make certain that you have covered all of the important, up-to-date, and pertinent texts. In the sciences and some of the social sciences it is important that your literature be quite recent; this is not so important in the humanities
- Make certain that all of the citations and references are correct and that you are referencing in the appropriate style for your discipline. If you are uncertain which style to use, ask your professor
- Check to make sure that you have not plagiarized either by failing to cite a source of information, or by using words quoted directly from a source. (Usually if you take three or more words directly from another source, you should put those words within quotation marks, and cite the page.)
- Text should be written in a clear and concise academic style; it should not be descriptive in nature or use the language of everyday speech
- There should be no grammatical or spelling errors
- Sentences should ﬂow smoothly and logically
- In a paper in the sciences, or in some of the social sciences, the use of subheadings to organize the review is recommended