CLOSER Discovery is a search engine that enables researchers to search and browse questionnaires and data from eight leading UK longitudinal studies. Users are able to search by keyword, or browse by topic. Discovery provides users with a range of features to improve their searches and find the data they are interested in. CLOSER Discovery is a user-friendly resource for locating the variables that best suit your research interests, and testing their robustness. Every month CLOSER Discovery is updated with more content and further features and functionality for users; see the FAQ for guidance and updates on the tool.