What Works Clearinghouse Procedures and Standards Handbook Version 3.0

What Works Clearinghouse: Procedures and Standards Handbook (Version 2.1)

The randomized controlled trial and comparison group quasi-experimental design standards published in 2008 are reproduced in this document, along with the pilot standards for regression discontinuity designs and single-case designs that were completed in 2010.

What Works Clearinghouse Procedures and Standards Version 2

WWC STANDARDS Brief: Confounding Factors

WWC STANDARDS Brief The What Works Clearinghouse (WWC) is an initiative of the U.S. Department of Education’s Institute of Education Sciences. The WWC evaluates research studies that look at the effectiveness of education programs, policies, and practices, which the WWC calls “interventions.” WWC Standards Briefs explain the rules the WWC uses to assess the quality of studies. For more informat...

Assessing Attrition Bias – Addendum

A. INTRODUCTION This document serves as an addendum to the existing attrition white paper (“Assessing Attrition Bias” version 2.1) previously used for the WWC Procedures and Standards Handbook, version 2.1. This document does not recommend any substantive changes to the version 2.1 attrition bounds. Instead, this addendum presents additional empirical information and sensitivity analyses to sup...

Reciprocal Teaching

No studies of the reciprocal teaching instructional method that fall within the scope of the Students with Learning Disabilities review protocol meet What Works Clearinghouse (WWC) evidence standards. Because no studies meet WWC evidence standards, at this time, the WWC is unable to draw any conclusions based on research about the effectiveness or ineffectiveness of reciprocal teaching on stude...