Robert E. Slavin is director of the Center for Research and Reform in Education at Johns Hopkins University, director of the Institute for Effective Education at the University of York, and the cofounder and chairman of the Success for All Foundation. He has authored or coauthored more than 200 articles and 20 books, including Educational Psychology: Theory into Practice (Allyn & Bacon, 1986, 1988, 1991, 1994, 1997, 2000, 2003), Cooperative Learning: Theory, Research, and Practice (Allyn & Bacon, 1990, 1995), Show Me the Evidence: Proven and Promising Programs for America s Schools (Corwin, 19...