One of the goals of the What Works Clearinghouse (WWC) is to promote informed decision making in education. To assist educators, policymakers, product developers, and researchers in their work, the WWC has produced documents that help users understand education research and the WWC review process, as well as technical working papers, which provide guidance for addressing difficult technical issues. If you would like more information than these documents provide, please contact the WWC.

Effect Size Interpretation Guidelines Evidence Standards Extent of Evidence Improvement Index Intervention Rating Scheme Random Assignment in Program Evaluation, Q&As Study Design Classification		Key Items to Get Right When Conducting a Randomized Controlled Trial In Education Reporting the Results of Your Study Teacher-Intervention Confound Technical Details of Computations Tutorial on Mismatch		Finding a Capable Evaluator Identifying and Implementing Educational Practices Supported By Rigorous Evidence: A User-Friendly Guide Registry of Evaluation Researchers