Abstract
This study examined the performance of four autistic boys each trained to a criterion of 80 percent correct on two sets of noun labels. After training, one set of labels was reviewed twice a week for nine weeks (summer vacation); the other set received no additional training. Performance on both sets was then retested. Each boy showed greater retention of the rehearsed compared with the unrehearsed material; one, placed on a VR3 schedule of reinforcement during the final stages of training, showed slightly better retention of the unrehearsed material than two trained exclusively with a CRF schedule. The authors argue that these data provide beginning support for the contention that seriously developmentally disabled children need to be in a program which offers year‐round schooling rather than an 180‐day school year.