A good literature review finds relevant academic literature and places it in a context that supports future research. In other words, what background does the audience need to know in order to understand the innovation that you are presenting in your thesis or article?
Reed, L. (1998). Performing a Literature Review. 1998 Frontiers in Engineering Conference. IEEE: Tempe, AZ. Available online.
Start at http://www.lib.purdue.edu. Click Search All. (Link opens a new window.)