Research shows that some elementary math curricula are more effective than others at increasing student achievement. Most studies in this research base typically included teachers and classrooms that differ, so the results represent "average" curriculum effects, which raises an important question: Are curricula that are effective on…

This randomized controlled field trial examined the efficacy of the Responsive Classroom (RC) approach on student achievement. Schools (n = 24) were randomized into intervention and control conditions; 2,904 children were studied from end of second to fifth grade. Students at schools assigned to the RC condition did not outperform students at…