Examined was the effectiveness of training four severely and profoundly retarded children (3-6 years old) to improve their level of functioning on a measure of object permanence and to demonstrate generalization to other areas of sensorimotor intelligence. Ss were given a pretest and posttest on the I. Uzgiris and J. Hunt instrument which consists of six parallel scales of intellectual development. Ss received individualized training on object permanence tasks for 45 minutes per day, 3 days per week for 6 months. Ss demonstrated large gains on the object permanence posttest measure, with smaller improvements in other areas of sensorimotor intelligence of four control Ss matched for age, etiology, and cognitive functioning level, only one S demonstrated improvement, and this was considered negligable. (CL)