![]() The search engines to include in a systematic review will vary depending on the subject field and question being asked. If you are getting more than 3,000 items from the first database used with the search strategy for the review the scope of the research question or the structure of the search strategy should be examined closely. The scope of your research question should be kept narrow so that a large number of irrelevant items do not have to be excluded from your result. Often the best test is to search a new resource for a limited component of a review to see if new items are identified. ![]() ![]() However, there are no rules about how many resources should be included. ![]() Usually in systematic reviews a researcher will search enough resources to be able to state with confidence that the literature for the subject area has been comprehensively searched. ![]()
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