How do I do a literature review?
Your professors will sometimes ask you to do a literature review before starting a paper or project. Generally, the purpose of a review is to analyze critically a segment of a published body of knowledge through summary, classification, and comparison of prior research studies, reviews of literature, and theoretical articles (http://writing.wisc.edu/Handbook/ReviewofLiterature.html). Your review will normally come after the introduction to your paper and present the research that has already been done. Your professors will have specific requirements, and the above link has some more information as well.