The purpose of the present study was to demonstrate and consolidate certain personality and learning phenomena associated with the concept of locus of control, particularly as it reflects the meaning fulness of a systematic research design which considers a number of related variables simultaneously. Schizophrenic, paraplegic, and orthopedic subjects were differentiated and categorized on the basis of their intrapersonal locus of control and subjected to a motor learning task in which the psychological situation was varied in terms of locus of control. Previous research had demonstrated the existence of locus of control as a theoretical construct, and had developed a few instruments and strategies for measuring it. The results clearly demon...