The assertive training literature has documented the effectiveness of both behavioral and cognitive methods to increase individual's assertiveness. However, the ability for such methods to enhance the generalization of treatment effects to untrained assertive response classes and the natural environment has been poor. In addition, little notice has been paid to the durability of these changes. Although the past several years have witnessed more intensive efforts by investigators to program generalization as part of their interventions, results have continued to be disappointing. A specific generalization-enhancing treatment strategy, self-directed practice, has been utilized with much success in phobic populations. This strategy, and the theoretical orientation it reflects, has been proposed for use in assertive training. The present study sought to examine the effectiveness of this method as compared to the traditional assertive training procedures and investigate the role of self-efficacy expectations in mediating initial behavior change and its subsequent generalization.