Examined the class formation procedures used in 22 elementary schools from two districts and the influence these procedures had on the composition of 200 classes, 56 of which were combination classes of students from two grade levels. Principals tended to assign higher ability and more independent students to combination classes to ease teacher…

Examined the class distributional properties of 200 elementary school classes in 2 school districts. Fifty-six classes were combination classes of students from 2 grades. Principals and teachers tended to assign higher ability and more independent students to such classes, and these assignments affected the class distributional properties.…

Critiques the conclusions of S. Veenman (1995) about multigrade classes and suggests that selection bias and lower-quality instruction should be included as part of the explanation for his findings of no difference. Indicates that multigrade classes have at least a small negative effect on achievement and potentially negative effects on teacher…

S. Veenman argues that his reviews of the literature lead to the conclusion that combination classes are neither worse nor better than single-grade classes. This rejoinder discusses disagreements with Veenman's findings, which are hampered by a narrow reading and interpretation of the literature on potential positive effects of combination…

Research on combination classes, in which students from two or more grades are placed with one teacher for most or all of the school day, is reviewed. Consistent research findings are that combination classes, distinguished from multiage/nongraded classes, have at least a small negative effect on student achievement. (SLD)