This guide was created to help you with your next systematic review and other review types that require comprehensive searching of the literature. Make sure to explore Review Types to discover the best review for your project from a Systematic Review to a Network Meta-Analysis. You may also be interested in using our Systematic Review Service to have the comprehensive search done completely for you by expert search librarians with systematic review methodological expertise, or you may find the Literature Searching section helpful to locate databases and grey literature sources. In addition, the Critical Appraisal section will assist you in making important decisions about the recommended tools needed for a complete critical analysis. Remember, our team of librarians are always here to assist you from start to finish.