Sixty-four moderately and severely retarded individuals enrolled in four sheltered workshops learned to assemble a 15 piece and a 24 piece bicycle brake. Training procedures utilized information obtained from the basic psychological research on discrimination learning. One-half of the subjects worked with the parts of the training task brake as they came from the factory (Form only). The others worked with parts that were color coded (Color Form). Coding consisted of painting that surface of each part that is facing the subject when it is placed in the proper position for assembly. All groups worked with the parts of the transfer task brake as they came from the factory (Form only). Half of the subjects learned the tasks to a criterion of six correct out of eight consecutive trials, the other half performed 20 trials beyond criterion on the training task brake (overlearning). The Color Form groups learned the training task brake significantly faster than the Form Only groups. No significant overlearning effect was found. (Author)