Two factor analytic studies of the Internal-External Control Scale, a forced-choice questionnaire, were carried out. In the first study, separate analyses for samples of male and female college students each yielded the following two factors: (1) generalized personal control, reflecting a belief about ability versus luck as a determinant of success with respect to self and others, and (2) system modifiability, reflecting a belief about the responsiveness of the sociopolitical system to citizen influence. In the second study, also based on samples of male and female college students, three factors emerged. The system modifiability factor was replicated, while a belief in ability versus luck emerged as two factors: (1) personal control, a reference to self, and (2) control ideology, a reference to others. (Author)