The purpose of the present study was to determine if performance of a selected group of mentally retarded adolescents can be influenced by pre-vocational training utilizing reinforcement therapy techniques. Several questions are raised. First, whether the investigator is able to study and delineate behavior characteristics of the selected mentally retarded adolescents. Second, whether behavior can be modified by pre-vocational training utilizing a reinforcement therapy program. Third, whether pre-vocational training influences performance of the mentally retarded adolescent
