This study examined the effects of self-efficacy and a two-stage training process on the acquisition and maintenance (i.e., retention) of complex interpersonal skills. In stage one, all participants received basic training in negotiation skills; behavioral measures of negotiation performance were taken following this training. During stage two, alternative post-training interventions (goal setting and self-management) were offered to facilitate skill maintenance. Six weeks later, behavioral measures of performance were repeated. Results indicated that pre-test self-efficacy contributed positively to both initial and delayed performance. While training condition contributed to skill maintenance, self-efficacy also interacted with post-training method to influence delayed performance. Specifically, self-management training attenuated the self-efficacy performance relationship, while goal-setting training accentuated performance differences between high and low self-efficacy trainees. Implications of these findings are discussed for researchers and practitioners concerned with interpersonal skills training.