Archived Resources
Webinar
Design Comparable Effect Sizes for Single-Case Design Studies
October 13, 2020
The WWC hosted a webinar on October 13, 2020 to discuss the use, application and estimation of the design-comparable effect size (D-CES) for single-case design studies (SCDs).
Video
Finding Tier 1, Tier 2, and Tier 3 Evidence from the What Works Clearinghouse
April 3, 2020
This presentation is on finding Tier 1, Tier 2, and Tier 3 evidence from the What Works Clearinghouse
Webinar
What’s New in Version 4.1 of the WWC Standards Handbook and Procedures Handbook?
January 22, 2020
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.
Webinar
Missing Data in Group Design Studies
April 11, 2019
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...
Webinar
Understanding the Updated WWC Procedures and Standards
November 16, 2017
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...
Guide
Reviewer Guidance for Use with the Procedures and Standards Handbooks V4.0
October 1, 2017
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...
Guide
Reviewer Guidance for Use with the Procedures and Standards Handbooks V3.1
December 1, 2016
The archived guidance document is provided here to inform WWC readers on the additional guidance provided to reviewers applying the previous version 3.1 procedures and standards.
Guide
Reviewer Guidance for Use with the Procedures and Standards Handbooks V3.0
March 1, 2016
The archived guidance document is provided here to inform WWC readers on the additional guidance provided to reviewers applying the previous version 3.0 procedures and standards.
Reference
September 1, 2014
Attrition occurs when members of the initial research sample are not part of the final analysis sample, such as due to missing data or leaving the study. Both the overall sample attrition and the diff...
Reference
July 1, 2013
Attrition occurs when members of the initial research sample are not part of the final analysis sample, such as due to missing data or leaving the study. Both the overall sample attrition and the diff...
Reference
A summary of the WWC recommendations on teaching math to young children provides suggestions for building on their interest in math.