Evaluated were variables effecting the differential performance of 627 educable mentally retarded Ss (mean age 14.5 years) on a test-train-retest task designed to measure learning potential. Family, social, health, schooling, and testing data were collected for the Ss of which 75% were students in public school special classes and 25% were…

Elementary school (kindergarten through sixth grade) deaf children were exposed to varied thinking activities based on J. Piaget's principle of action rooted intelligence to determine if thinking might be successfully encouraged in the classroom through activities which were not highly dependent on verbal performance. Each class of approximately…