Literature on achievement effects of practical applications of group-based mastery learning in elementary and secondary schools over at least four weeks is examined, using the best-evidence synthesis review technique (a combination of meta-analysis and narrative reviews). There was essentially no evidence to support the effectiveness of…

This article examines the literature on achievement effects of practical applications of grouped-based mastery learning in elementary and secondary schools. The review found no evidence to support the claim that mastery learning improves student performance on standardized achievement measures. (RB)

In this rejoinder, R. Slavin responds to a broad range of technical and philosophical issues about his use of best-evidence synthesis to research the effectiveness of mastery learning. (RB)

Findings of positive effects of mastery learning on experimenter-made measures can be interpreted as supporting the view that this technique may help focus teachers on a given set of objectives. The claim that mastery learning can accelerate achievement, in general, in elementary and secondary schools is still awaiting evidence. (SLD)