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Slavin, Robert E.; Lake, Cynthia; Groff, Cynthia – Center for Data-Driven Reform in Education, 2008
This article reviews research on the achievement outcomes of mathematics programs for middle and high schools. Study inclusion requirements included use of a randomized or matched control group, a study duration of at least twelve weeks, and equality at pretest. There were 102 qualifying studies, 28 of which used random assignment to treatments.…
Descriptors: Evidence, Cooperative Learning, Effect Size, Control Groups