In a study using 73 females and 30 male undergraduates, information on the basic dimensions of Millon's eight personality styles was obtained from correlations of the Millon Behavioral Health Inventory with Rotter's I-E scale and Byrne's R-S scale. Hypotheses predicting a significant relationship between the active-passive and repression-sensitization were generally supported. Predictions of a significant relationship between the dependent-indepenent dimension and generalized expectancy of locus of control were not supported. Implications of these findings for the efficacy of Millon's system are discussed, along with future research possibilities.