This video demonstrates a number of tasks reviewers usually do before performing a full-scale systematic search. For example, a preliminary search is usually conducted to find out if anyone else has done a review on the topic before. Reviewers also do "scoping" searches or "pearl-growing" searches to better understand existing primary studies on the topic. These techniques also help develop a list of search terms that can be used in the full-scale search. Finally this video gives examples of online databases, which reviewers may search depending on the subjects of their topics.