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

The following citation should be used when referencing all IES/WWC products:

U.S. Department of Education, Institute of Education Sciences, National Center for Education Evaluation and Regional Assistance, What Works Clearinghouse.

Viewers are permitted to download WWC reports for duplication without requesting copyright permission. The WWC does request that authorship be noted in the case of reproduction. Viewers are asked to contact individual study authors for permission to duplicate original studies, as these studies are not the property of the WWC.

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.

Product Disclaimer
The WWC does not endorse particular interventions, nor does it conduct field studies. Rather, the WWC gathers available evidence on particular educational interventions and provides reviews of existing evidence against our standards.

The What Works Clearinghouse is funded by the U.S. Department of Education’s Institute of Education Sciences and is managed by Mathematica Policy Research, Inc. The views expressed on this website do not necessarily reflect the views of the U.S. Department of Education.

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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