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Unless stated otherwise, all information on the U.S. Department of Education's Institute of Education Sciences website at http://ies.ed.gov/ncee/wwc/ is in the public domain and may be reproduced, published, linked to, or otherwise used without IES' permission. This statement does not pertain to information at websites other than http://ies.ed.gov, whether funded by or linked to from IES or WWC.

The following citation should be used when referencing all IES/REL products:
U.S. Department of Education, Institute of Education Sciences, National Center for Education Evaluation and Regional Assistance, What Works Clearinghouse

WWC Products meet IES Standards

All WWC projects and studies must undergo the National Center for Education Evaluation and Regional Assistance's rigorous peer review processes, ensuring the highest quality evidence is produced and widely disseminated.
 

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Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not constitute or imply endorsement, recommendation, or favoring by the United States Government.

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