Used data from Tennessee's Project STAR, a longitudinal class size experiment, to study the cumulative effects of reduced class size in the early grades on academic achievement. Results indicated that controlling for achievement in the previous year, small classes in grades 1-3 yielded statistically significant additional positive effects on…

Recent research from randomized experiments on class size points to positive effects of small classes that persist for several years, but the evidence about the social distribution of effects is less clear. Some scholars have contended that the immediate effects of small classes are larger for minorities and for disadvantaged persons (e.g., J. D.…

The authors examined the conditions that promote or discourage engagement in the classroom among kindergarten students. Engagement included learning behaviors (on-task behavior) and pro- and antisocial behavior. The authors examined 3 policy-manipulable features of kindergarten classrooms: (a) whether the class met for a half day or full day, (b)…