1 University Libraries Carnegie Mellon University Pittsburgh Pennsylvania USA.
2 NIHR CLAHRC South West Peninsula (PenCLAHRC) University of Exeter Medical School Exeter UK.
3 Campbell UK & Ireland, Centre for Evidence and Social Innovation Queen's University Belfast UK.
4 Albert R. Mann Library Cornell University Ithaca New York USA.
5 University of North Carolina at Chapel Hill Chapel Hill North Carolina USA.
6 Centre for the Study of Learning and Performance Concordia University Montréal Québec Canada.
7 Libraries and Cultural Resources University of Calgary Calgary Canada.
8 NIHR PenCLAHRC, Institute of Health Research University of Exeter Medical School Exeter UK.
9 VIVE-The Danish Center for Social Science Research Copenhagen Denmark.

This is the protocol for a Campbell review. The aim of this study is to comprehensively assess the quality and nature of the search methods and reporting across Campbell systematic reviews. The search methods used in systematic reviews provide the foundation for establishing the body of literature from which conclusions are drawn and recommendations made. Searches should be comprehensive and reporting of search methods should be transparent and reproducible. Campbell Collaboration systematic reviews strive to adhere to the best methodological guidance available for this type of searching. The current work aims to provide a comprehensive assessment of the quality of the search methods and reporting in Campbell Collaboration systematic reviews. Our specific objectives include the following: To examine how searches are currently conducted in Campbell systematic reviews. To identify any machine learning or automation methods used, or emerging and less commonly used approaches to web searching. To examine how search strategies, search methods and search reporting adhere to the Methodological Expectations of Campbell Collaboration Intervention Reviews (MECCIR) and PRISMA guidelines. The findings will be used to identify opportunities for advancing current practices in Campbell reviews through updated guidance, peer review processes and author training and support.