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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 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 the What Works Clearinghouse (WWC).

The following citation should be used when referencing all IES/Regional Educational Laboratory Program (REL) products:

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

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