The purpose of this paper is to present the psychometric properties and individual items comprising the Children's Assertive Behavior Scale (CABS). The CABS is a behaviorally designed self-report instrument for children which measures general and specific social skills and covers many socially relevant situations which are problematic for children. Acceptable psychometric properties of the 27-item test were obtained in several independent investigations across both geographical regions and grade levels. The CABS showed significant concurrent validity with peer, parent, and teacher measures of social competency. The CABS also discriminated trained versus untrained children participating in social skills versus a placebo discussion group. The instrument is presented, along with recommendations for future applications and research.