A theoretical model of the relationship between class size and achievement is proposed, based on the assumption that a teacher adjusts the style and pace of a lesson to the least able student. The model accounts for features of the Glass and Smith meta-analysis of research. (Author/MT)

Subjects stratified by ability and extroversion initially achieved concept attainment in homogeneous (all introverts or all extroverts) or heterogeneous (one-half of the members extroverts) personality groups. Concepts were attained individually in a subsequent transfer stage. (Authors/JA)

Grouping heterogeneously, homogeneously, and flexibly made no significant difference in academic achievement in research done on 260 children over a 2-year period. (Editor)

This article presents a meta-analysis of studies of the effects of special homogeneous classes versus regular heterogeneous classes on achievement and nonachievement outcomes of gifted students. The principal findings indicate that the gifted students in special classes achieved more than their gifted counterparts in regular classes. (Author/IAH)

This study examined whether graphic organizer instruction would facilitate comprehension, recall, and information transfer, and how much explicit instruction was necessary for independent generation of graphic organizers. Fifth graders read social studies information with or without graphic organizers and explicit instruction. Explicitness and…

An anxiety scale was administered to fifth- and eighth-grade students in West Germany immediately after and three years after placement in a high, low, or middle school track based on achievement. Findings from this investigation are related to reference group theory. (Authors/CJ)