Searching for existing knowledge and evidence in the health literature is a major foundation of the knowledge to action cycle. Producing and summarizing existing evidence from multiple sources to address knowledge or action gaps is the one of the first tasks of any KT work. Once summaries are identified or done, those involved in KT work also need to learn about methods and tools that have been used in previous KT projects and how best to build new programs based on theoretical constructs of KT. This chapter describes where to find the information important to KT. It then provides the vocabulary that can be used to search resources that one might encounter. In addition to using the resources outlined in this chapter, contacting librarians and others experienced in searching will also help on the road to successful searching.