Research has revealed a considerable degree of stability of Type A behavior from adolescence to adulthood. Other research has reported an association between anger and certain dimensions of cardiovascular risk in adolescent subjects. Such findings suggest that further study of the Type A phenomenon as it is expressed in adolescents may enhance current understanding of coronary prone behavior and may provide a means through which to identify Type A patterns early enough in the lifespan to introduce preventive strategies when needed. This study sought to describe the experience and expression of anger, hostility, and interpersonal aggressiveness in 19 Type A and 11 Type B adolescent males. Subjects completed the Adolescent Structured Interview, the State-Trait Anger Scale, and the Interpersonal Behavior Survey. The results revealed no significant differences between Type A's and Type B's on self-report measures of global anger and aggressiveness, and no significant relationship between interpersonal hostility and self-confidence for Type A's or Type B's. Type A's were found to be more likely than Type B's to lose their temper and to act in physically aggressive, verbally aggressive, and passive aggressive ways. (Author/NB)