Description
Item Description:Title from PDF title screen (viewed Aug. 5, 2009).
"September 2008."
"NCEE 2008-012."
"This report was prepared for the National Center for Education Evaluation and Regional Assistance, Institute of Education Sciences under contract edition-07-CO-0062 by the What Works Clearinghouse, which is operated by Mathematica Policy Research, Inc."--P. [ii].
Electronic resource.
Physical Description:1 online resource (iv, 81 pages)
Bibliography:Includes bibliographical references (pages 72-81).