This infographic highlights the WWC’s process for extracting data and estimating effect size for reviews and reconciliations of single-case design studies

This infographic provides tips for becoming a certified reviewer as well as additional information about the certification process.

This infographic highlights what the WWC has discovered through rapid screening and reviews about the research behind distance learning programs and practices.

This webinar provides an introduction to review protocols particularly for WWC-certified reviewers, protocol authors, review team leadership, and researchers whose studies may be reviewed by the WWC.

The WWC hosted a webinar on January 22, 2020 to discuss changes between the Version 4.0 and 4.1 WWC Standards Handbook and Procedures Handbook.

The WWC hosted a webinar on October 29, 2019 to provide WWC reviewers and other participants with guidance on WWC standards for reviewing evidence from fuzzy regression discontinuity designs (FRDDs).

On May 14, 2019, the What Works Clearinghouse (WWC) hosted a free webinar on documenting contextual information in reviews of group design studies. The slide deck and archived Q&A responses are also a...

On April 11, 2019, the What Works Clearinghouse (WWC) hosted a free webinar on the new guidelines for reviewing analyses with missing or imputed data under the WWC Standards Handbook, Version 4.0.

On April 11, 2019, the What Works Clearinghouse (WWC) hosted a free webinar on the new guidelines for reviewing analyses with missing or imputed data under the WWC Standards Handbook, Version 4.0. The...

On November 16, 2017, the What Works Clearinghouse (WWC) delivered a presentation on the Version 4.0 Procedures and Standards Handbooks, which were released October 30, 2017. The approaches researcher...

The What Works Clearinghouse (WWC) Procedures and Standards Handbooks (version 4.0) provides reviewers with a detailed description of the procedures and standards used by the WWC in the review of stud...

The What Works Clearinghouse (WWC) Procedures and Standards Handbook (version 3.0) provides reviewers with a detailed description of the pilot single-case design standards and procedures. The WWC work...

This What Works Clearinghouse (WWC) webinar covers how the current WWC Procedures and Standards Handbook can be applied to postsecondary research. The presenters Will Doyle from Vanderbilt University,...

Attrition (loss of sample) occurs when individuals initially included in a study are not included in the final study analysis. Attrition is a common issue in education research and can occur for many ...

As part of the WWC review process for certain types of studies, reviewers assess whether the intervention group (those that received the intervention of interest) and the comparison group (those that ...

A confounding factor is an aspect of a study that makes it impossible to tell whether the intervention or that factor is responsible for differences in outcomes. In WWC study reviews, certified review...