Rotter's Internal-External (I-E) locus of control scale, the MMPI, and the CPI were administered to 100 males in a nonacademic environment. Relationships between I-E and the other measures were examined: a sizeable amount of the variance in I-E scores was accounted for by MMPI and CPI scales, but a discriminant analysis failed to enable reliable predictions of I-E from the other scales. The findings were discussed in terms of their relationships to previous research and implications for future investigations. (Author)