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The What Works Clearinghouse (WWC) collects, screens, and identifies studies of effectiveness of educational interventions (programs, products, practices, and policies).The WWC regularly updates the WWC Technical Standards and their application to take account of new considerations brought forth by experts and users. Such changes may result in re-appraisals of studies and/or interventions previously reviewed and rated. The current WWC Standards offer guidance for those planning or carrying out studies, not only in the design considerations but the analysis and reporting stages as well. The WWC Standards, however, may not pertain to every situation, context, or purpose of a study and will evolve.

*NEW* for WWC Intervention Reports
Intervention Rating: Characterizes the strength of the evidence for an intervention
Improvement Index: Provides a sense of the size of the intervention’s effect

Reviews Available Now

Young boy reading a bookBeginning Reading  New.  This review focuses on reading interventions that address student outcomes for students in grades K-3 in four domains: alphabetics (phonemic awareness, phonological awareness, phonics, letter knowledge, or print concepts), reading fluency, comprehension (vocabulary or reading comprehension), and general reading achievement.
Teacher helping young boyEarly Childhood Education  New.  This review focuses on curricula and practices designed for use in center-based settings with three- to five-year old children who are not yet in kindergarten, with a primary focus on cognitive and language competencies associated with school readiness (language, literacy, math, and cognition).
Two students wearing cap and gown at graduation ceremonyDropout Prevention  New.  This review focuses on interventions in middle school, junior high school, or high school designed to increase high school completion, including techniques such as the use of incentives, counseling, or monitoring.
Student working on a subtraction problemElementary School Math  New.  This review focuses on curriculum-based math interventions that specify clear learning goals for students and assess student outcomes related to mathematic achievement.
Student readingEnglish Language Learners  New.  This review focuses on interventions designed to improve the English language literacy or academic achievement of elementary school students who are English language learners.
Four children working together at a tableCharacter Education  New.  This review focuses on programs designed to increase student outcomes related to positive character development, prosocial behavior, and academic performance.
Two middle school students working on computersMiddle School Math Curricula.  This review focuses on curriculum-based interventions outlining the fundamentals of mathematics for middle-school students.


Reporting the Results of Your Study: A User-Friendly Guide for Evaluators of Educational Programs and PracticesA User-Friendly Guide for Evaluators of Educational Programs and Practices. The purpose of this guide is to provide researchers, and those who sponsor and use research, with clear, practical advice on reporting the results of "impact" studies.

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Evaluator Registry. This resource is designed to identify potential evaluators to conduct studies on educational outcomes.
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The What Works Clearinghouse (WWC) was established in 2002 by the U.S. Department of Education's Institute of Education Sciences (IES) to provide educators, policymakers, researchers, and the public with a central and trusted source of scientific evidence of what works in education.

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 Reading Recovery®
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