We use data from a randomized controlled trial of a middle school science intervention to explore the causal mechanisms by which the intervention produced previously documented gains in student achievement. Our study finds that implementation fidelity, operationalized as a measure of the frequency of implementation of the cognitive science…

English as a second language (ESL) courses seek to address a primary barrier to college success for language minority students: second language issues that can inhibit their success in college-level coursework. But, there is a limited understanding of the effects of ESL on college student outcomes. Using a rich, longitudinal data set that includes…

Contingent valuation (CV) is used to obtain more complete estimates of the economic value of benefits of preschool education for handicapped children. A general approach for use of CV in cost-benefit analysis of educational programs and use of the CV interview with 80 parents of handicapped preschoolers are described. (SLD)