The use of ability variables for grouping students is pervasive in elementary schools. Teachers form these groups judgmentally, taking into account formal (e.g., test) and informal (e.g., personal observation) sources of information. Their judgments of students' abilities are reasonably accurate. Such grouping can be explained as functional on…

A commentary precedes this previously published study that indicates fifth-grade and eighth-grade students in homogeneous classes perceived that their teachers held higher expectations of them than did students who were heterogeneously grouped. The statistical methods used in the study are explained, along with key findings. (Contains references.)…

Many secondary teachers perceive a wide range of studennt ability levels within a class as a constraint on effective teaching and classroom management. This study was conducted to determine which levels of teaching effectiveness, which learning environments, and which classroom management problems were associated with very heterogeneous classes,…