Class-size reduction (CSR) mandates presuppose that resources provided to reduce class size will have a larger impact on student outcomes than resources that districts can spend as they see fit. I estimate the impact of Florida's statewide CSR policy by comparing the deviations from prior achievement trends in districts that were required to…

Based on pupil-specific observation data drawn from a sample of 13 fifth-grade math classrooms, this article reports efforts to develop and test an economic model of the allocation of teacher resources within classrooms. Tables provide data on teacher attention and resources. (PB)