Featured items

Webinar
Effect Size and Standard Error Formulas
December 2, 2020

Join the What Works Clearinghouse (WWC) for a webinar on the effect size and standard error formulas new to Version 4.1 of the WWC Standards Handbook and the WWC Procedures Handbook. This webinar is i...
Infographic
Group Design Standards Training: Tips for Becoming a Certified Reviewer
October 1, 2020

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

Resources for WWC Reviewers

Webinar
Effect Size and Standard Error Formulas
December 2, 2020

Join the What Works Clearinghouse (WWC) for a webinar on the effect size and standard error formulas new to Version 4.1 of the WWC Standards Handbook and the WWC Procedures Handbook. This webinar is i...
Infographic
Data Extraction and Effect Size Estimation for Single-Case Design Studies
November 1, 2020

This infographic highlights the WWC’s process for extracting data and estimating effect size for reviews and reconciliations of single-case design studies
Infographic
Group Design Standards Training: Tips for Becoming a Certified Reviewer
October 1, 2020

This infographic provides tips for becoming a certified reviewer as well as additional information about the certification process.
Infographic
Reviewing the Available Research on Distance Learning
June 22, 2020

This infographic highlights what the WWC has discovered through rapid screening and reviews about the research behind distance learning programs and practices.
Webinar
WWC Review Protocols: What's the Point?
May 14, 2020

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.
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
WWC Standards for Reviewing Fuzzy Regression Discontinuity Designs
October 29, 2019

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).
Webinar
Documenting Study Context in WWC Reviews of Group Design Studies
May 14, 2019

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...
Reference
Acceptable Methods for Addressing Missing Data
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.
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...
Reference
Key Criteria Used in WWC Reviews of Single-Case Design Research
January 1, 2017

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...
Webinar
Applying the What Works Clearinghouse Standards to Postsecondary Research
March 10, 2016

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,...
Reference
Attrition
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 ...
Reference
Baseline Equivalence
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 ...
Reference
Confounding Factors
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...

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