Description
Item Description:Title from title screen (viewed Dec. 18, 2009).
"July 2009."
"NCEE 2009-012."
"This report was prepared for the National Center for Education Evaluation and Regional Assistance, Institute of Education Sciences under Contract ED-07-CO-0062 by the What Works Clearinghouse, a project of Mathematica Policy Research, Inc."--Page [ii].
Physical Description:1 online resource (iv, 92 pages) : illustrations.
Bibliography:Includes bibliographical references.