The document introduces the BEAM framework for evaluating sources, which categorizes sources as Background, Exhibit/Evidence, Argument, or Method. It provides examples of the types of sources that fit within each BEAM element and how students can use these different source types to explore their research topic, understand how their topic has been treated by others, and justify their own argument. The document also suggests databases and resources for finding sources relevant to each BEAM element to effectively research and write about a topic.