Describes a study of Korean elementary school students that was conducted to investigate the effects of differing types of instructional control strategies and cognitive style on achievement in arithmetic skills using computer-assisted instruction. Hypotheses tested are discussed, time on task is investigated, and future research is suggested.…

This meta-analysis of 49 comparative studies shows that mastery testing has positive effects on student learning, but the size of effect depends on the stringency of the criterion used and the degree of experimental control. The effects of instructional time, student attitudes, and differences in ability levels are also addressed. (Author/LRW)