As the public profile of early childhood education has increased, state education agency staff, policymakers, and researchers are interested in understanding the lasting impacts of quality pre-K. Particularly for states beginning an investment in early childhood education or expanding access to an existing program, it is important to examine the…

Although some literacy researchers consider grouping students for reading instruction to be a proven educational practice, the support for this belief is lacking from a research synthesis perspective. With this idea in mind, Slavin comments in the middle of his review on the effects of grouping: "there is not enough research on within-class…

This paper reviews research on grouping of students within classes and its effects on learning. Primary consideration is given to grouping and mixing students by ability, though consideration is also given to grouping and mixing students by ethnicity and gender as well as to research on the effects of group size. Results of meta-analyses of…