Utilizing data derived from 277 rural, male respondents initially enrolled in Lenawee County, Michigan high schools, the Rotter's Internal-External Locus of Control Scale was employed to test the hypothesis that locus of control will have interactive rather than additive effects on the process of status attainment. Locus of control was defined as a variable describing one's belief or doubt regarding his ability to control the events in his life. Internals were defined as persons who perceive their own efforts as instrumental in attaining their goals; externals were defined as those who consider their lives to be determined by external conditions, chance, or luck. Locus of control was measured only in the second of the two data-waves taken 15 years apart (1957 and 1972). Variables compared for internals and externals were status outcomes, intergenerational mobility, independence, enactment of aspirations, learning efficiency, intragenerational (in-career) mobility, and overall predictability (indeterminancy). Results indicated the following: no statistically significant differences between internals and externals regarding their means for educational, occupational, and income attainments; significant differences in the attainment processes of the two groups, as expressed by standardized regression coefficients in status attainment models; less mobility among externals in their early careers; a greater degree of influence on the attainments of internals by educational aspirations and attainments. (JC)