Using empirical evidence from 48 classrooms, argues that structural and organizational factors affect the stability and the formation of ability groups in an elementary classroom, which in turn affect growth in academic achievement. Holds that teachers are often impeded from forming the types of groups most conducive to student learning. (CMG)

This paper investigates the formation and evolution of friendship cliques among preadolescent youth in elementary and junior high grades 4 through 8. Two sets of data were collected: the first set consisted of cross sectional data from 51 classes (grades 5 through 8); the second set contained sociometric data collected from 11 classes (grades 4…