Providing a program for teaching assertive behavior and social skills to adolescents, this manual contains specific instructions, activities, worksheets, and homework assignments. (Assertive behavior is typically distinguished from both passive behavior and aggressive behavior and is believed to be a component of effective social and psychological functioning.) The activities and procedures offered are organized into materials for 12 sessions and are presented in a manner intended to facilitate their use by teachers, counselors, social workers, or psychologists working with groups of children. Although designed for adolescents, the activities may be modified for younger children. Procedures have been field-tested in various settings and have been shown to enhance children's assertive skills, self-descriptions, and sense of responsibility. Experience in conducting the assertiveness program indicates that 45-minute sessions held twice a week are appropriate. It is important to note that teachers or counselors who know little about assertion training principles should obtain training before attempting to implement these procedures and, of equal importance, obtain the services of a consultant who will act as a resource person while the course is conducted. A set of 40 additional assertion training activities, based on situations involving requests and refusals, is appended. (RH)