A transfer of stimulus control procedure was used to teach three profoundly retarded adolescents a series of specific responses to specific verbal instructions. After imitative control of a behavior was established, a verbal instruction was presented immediately before the behavior was modelled. Each correct response was followed on the next trial by inserting a delay between the verbal instruction and the modelling of the behavior.The delays increased from trial to trial. Transfer of stimulus control was indicated when a subject responded correctly on five consecutive trials before the behavior was modelled. All three subjects responded correctly to each verbal instruction after that item was trained in a multiple-baseline order. Generalization did not occur to items that had not been trained. Probe data revealed that some variations of the verbal instructions controlled responses after training was completed.The prevalence of speech and language disorders among retarded populations has frequently been documented (Schlanger and Gottsleben, 1957;Spradlin, 1963). Thus, it is not unusual that many attempts to modify the speech and language-related skills of such populations have occurred (Baer, Peterson, and Sherman, 1967;Bricker and Bricker, 1970; Johnson, Capobianco, and McLean, 1970;Miller, 1960). Many of these initial attempts have focused on motor imitation or the correct production of speech with institutionalized subjects. Yet, for the institutionalized retardate, environmental contingencies are organized so that reinforcement is more likely to occur for behaviors such as being able to follow instructions.