Using results of a best-evidence synthesis and a meta-analysis of an extensive international database, it is argued that there is no empirical evidence at the moment showing that student learning suffers in combination classes. No support is found for the selection bias suggested by D. Mason and R. Burns (1997). (SLD)

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…

This article reviews the best evidence concerning the cognitive and noncognitive effects of multigrade (students of more than one grade taught by one teacher) and multiage (students grouped for expected benefits) classrooms. Studies of noncognitive, cognitive, and achievement effects reveal no adverse effects of learning in such classrooms. (SLD)