In order to test the ubiquity of the structure of the intellect for predictors of performance, a psychomotor skill (M 16 rifle proficiency test), a measure of perseverance (completion or resignation from OCS Program), and a measure of leadership ability (peer ratings) were selected as criteria on which multiple regressions were conducted with a battery of 37 tests of different elements of the structure of the intellect. A functionally significant correlation with any of the three criteria would support a rationale for greatly increased work in that area. Functionally significant correlations for all three criteria would support a unified theory of human potential. Subjects were 100 OCS candidates at Fort Benning, Ga. The p.05 level of significance for the multiple R was used as the criterion for selecting the terminal step in the multiple regression program. The Pearson and Biserial correlations among the pairs of criteria are: (1) peer ratings with M 16 scores--r=.21; (2) peer ratings with course completion--r=.23; and (3) M 16 scores with course completion--r=.06. The data obtained support a unified theory of human potential and have wide implications for intelligence testing, personality theory, and prediction of performance. (Author/KM)