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What Works Clearinghouse

Evidence for What Works in Education

We review the research on the different programs, products, practices, and policies in education.

Then, by focusing on the results from high-quality research, we try to answer the question “What works in education?”

Our goal is to provide educators with the information they need to make evidence-based decisions.

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The WWC conducts a comprehensive search of the literature and is not limited to studies that appear in peer reviewed journals. Currently, the WWC reviews four types of study designs that can provide causal evidence: randomized controlled trials, quasi-experimental designs with a matched comparison group, regression discontinuity designs (RDD), and single-case designs (SCD). The WWC’s standards for RDD and SCD designs are in the pilot phase.