Research suggests that if you want more students to learn more material, if you want students to feel more confident about themselves, and to be motivated to learn, if you want them to accept differences among students, then you should have your students learn cooperatively (Johnson and Johnson, 1982; Johnson, 1981). For the past 15 years, the staff at the Cooperative Learning Center at the University of Minnesota researched the effects on learning of different patterns of interaction among students. This article was first published in September, 1987.