A literature review provides an overview of the scholarly writings published on a topic by scholars and researchers. Specifically, a literature review:
Focuses on a particular question, area of research, theory or issue.
Provides an overview of the existing literature on a topic and reflects a critical analysis of this research.
Demonstrates that you've read extensively in your field, have a thorough understanding of that field, and are capable of intelligently critiquing others' work.
The literature review forms the justification for your research. It is the platform upon which you will build your argument, place your research in context, and demonstrate how your research improves the discipline.
Why do we write literature reviews?
Literature reviews provide you with a handy guide to a particular topic. If you have limited time to conduct research, literature reviews can give you an overview or act as a stepping stone. For professionals, they are useful reports that keep them up to date with what is current in the field. For scholars, the depth and breadth of the literature review emphasizes the credibility of the writer in his or her field. Literature reviews also provide a solid background for a research paper’s investigation. Comprehensive knowledge of the literature of the field is essential to most research papers.
How is a literature review different from an annotated bibliography?
A literature review is written in the style of an expository essay; it comprises an introduction, body and conclusion, and it is organized around a controlling idea or thesis. An annotated bibliography is simply an alphabetized list of sources accompanied by comments. Moreover, while a single source appears just once in an annotated bibliography, it may be referred to numerous times in a literature review, depending upon its importance in the field or relationship to other sources. Finally, a literature review includes its own intext citations and bibliography or works cited list.
How is a literature review different from a traditional research paper?
A literature review may stand alone and be assigned or published as a discrete entity. Or it may constitute one section of a larger research paper or one chapter—usually the first—of a thesis. Whereas the main body of a research paper focuses on the subject of your research, the literature review focuses on your sources. Put another way, in the research paper you use expert sources to support the discussion of your thesis; in a literature review, you discuss the sources themselves.
How is a literature review structured?
Find a focus
A literature review, like a term paper, is usually organized around ideas, not the sources themselves as an annotated bibliography would be organized. This means that you will not just simply list your sources and go into detail about each one of them, one at a time. No. As you read widely but selectively in your topic area, consider instead 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.
A literature review may not have a traditional thesis statement (one that makes an argument), but you do need to tell readers what to expect. Try writing a simple statement that lets the reader know what is your main organizing principle. Here are a couple of examples:
The current trend in treatment for congestive heart failure combines surgery and medicine.
More and more cultural studies scholars are accepting popular media as a subject worthy of academic consideration.
Like any expository essay, a literature review should have an introduction, body, and conclusion.
The introduction should contain your research question, an explanation of its significance, and any other background information setting the context of your research.
The body paragraphs contain your summative, comparative, and evaluative comments on the sources you've found. These comments may pertain to
historical background & early research findings
areas of controversy among experts
areas of agreement
dominant views or leading authorities
varying approaches to or perspectives on the subject
qualitative comparisons and evaluations
The conclusion summarizes major issues in the literature; it also establishes where your own research fits in and what directions you see for future research.
How is a literature review organized?
While covering the range of matters listed above, a literature review—like any expository essay—should still have a single organizing principle expressed in a thesis statement. Some common ones are these:
Chronological — "A review of the literature of the past fifty years shows research on the motivation behind terrorist acts shifting focus from the psychological to the political and now the religious."
Thematic — "While a review of the literature suggests some concensus among researchers regarding the psychological state of most terrorists immediately preceding the commission of a terrorist act, there appears to be little agreement regarding the psychological profile of potential terrorists."
Methodological — "In the effort to understand political extremism, researchers have taken various approaches. Some have surveyed vast libraries of historical literature; others have sifted through stores of church and government data; still others have used the ethnographer's tools of first-hand interview and observation."
Qualitative — "The very concept of religious fanaticism suggests bias, and, while a few serious researchers in the area manage to maintain objectivity, a review of the literature reveals bias in many studies, especially those quoted most often in the popular media."
Note: A literature review is about the existing literature on your subject and provides background for your own research findings or commentary. However, it is NOT primarily about you or your relationship to the literature. Therefore, a literature review should NOT be organized as a narrative of your own research process. A literature review that says essentially "First I found this source, then I found this one ...." is NOT acceptable.