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WWC Process Brief: The Study Review Process
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What Works Clearinghouse, 2017
The What Works Clearinghouse (WWC) evaluates research studies that look at the effectiveness of education programs, products, practices, and policies, which the WWC calls "interventions." Many studies of education interventions make claims about impacts on students' outcomes. Some studies have designs that enable readers to make causal…
Descriptors: Program Design, Program Development, Program Effectiveness, Program Evaluation
WWC Standards Brief for Attrition
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What Works Clearinghouse, 2015
The What Works Clearinghouse (WWC) Standards Briefs explain the rules the WWC uses to evaluate the quality of studies for practitioners, researchers, and policymakers. 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…
Descriptors: Program Effectiveness, Educational Research, Attrition (Research Studies), Student Attrition