The faculty and staff at the library do our best to help students and faculty with literature searches and to assist in the production and publication of literature reviews. A literature review does not present an original argument. Rather, the purpose is to offer an overview of what is known about the topic and to evaluate the strength of the evidence presented. It usually contains a summary, a synthesis, and an analysis of the key arguments in the existing literature. The literature may come from books, articles, reports or other formats. Sources may even contradict each other. A literature review also helps distinguish what research has been done and identify further research needs.