Past research suggests that Type A's have a higher need for control than Type B's, and empirical evidence documents their greater reactivity to control loss. To extend investigation to control decisions and examine the hypothesis that Type A's would be less willing than Type B's to relinquish control to another person, 160 male undergraduates were classified as Type A's or Type B's based on the Jenkins Activity Survey, Form T. On an initial 20-trial reaction-time task, Type A and B subjects received feedback about their own performance, and that of a partner. The feedback indicated equal or superior performance by the partner. On a subsequent replication of the task where only one person could work on any one trial, Type A's, relative to Type B's, were found to relinquish fewer trials to their partners, particularly when the partner had exhibited a superior initial performance. Attribution data indicated that Type A's were less convinced of the diagnosticity of their partners' initial performance with respect to its likelihood of replication, justifying lower relinquishment. Thus, in a situation where competence information and control needs conflicted, Type A's appeared to be less rational decision-makers than Type B's; their control needs appeared to override the most effective use of available information. Additional attribution data suggested, however, that Type A's made decisions which they believed would lead to successful task performance. Results indicated clear differences in control relinquishment by Type A's and B's as a function of feedback about their partner's performance, but no such differences emerged with respect to feedback about the subject's own performance. (Author/JAC)