Lehmann, Roxane L.Center for Applied Research and Educational Improvement2007-09-102007-09-102002-04http://purl.umn.edu/1305Paper prepared for AERA Annual Meeting 2002.This randomized experiment at the middle school level examined the differential effects of the "one-size-fits-all" approach to instruction and the instructional practice of differentiating the task so the "task fits individual" in a teacher-assigned and a student-chosen condition. The study examined the effects of these three conditions on a variety of achievement and reasoning behaviors for students of various skill levels.en-UScurriculum and instructioncurriculum differentiationReport