California was, and remains, the largest "experiment" in class-size reduction (CSR) in the country's history. Its sweeping program to reduce the state's classes in kindergarten through the third grade covered nearly 2 million students and dropped the average class size from almost twenty-nine students per class, and often a great many…

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)…