This study was designed to study the effect of locus of control on the career maturity of a cross-section of age groups. The effects of race and sex were also studied. The Career Development Responsibility Scale (Thomas, l974), the Career Maturity Inventory Attitude Scale (Crites, 1973), and a measure of socioeconomic status were employed to collect the data. The latter variable was used as a covariable. The analysis of covariance produced significant main effects for race and locus of control. The mean maturity score was significantly greater for whites. Externals were significantly less mature in their career attitudes. (Author)