Assertion training should be an integral part of preservice teacher training so that, when beginning teachers enter the classroom, they will be confident and able to establish a positive learning climate and minimize discipline problems. A graduate course was developed to assist teachers to develop assertive communication and to use assertive beliefs and strategies to enhance the learning environment and maintain effective classroom discipline. The class had four components: (1) self analysis of communication style, strengths, and weaknesses; (2) introduction to basic assertive training strategies and problem solving; (3) development of individual discipline plans; and (4) behavior rehearsal, using role-playing to improve or refine technique. Assertiveness training concentrates on rights-oriented communication, and attempts to develop respect for students, school staff, and administrators while emphasizing the need for self-respect. By assisting teachers to communicate in an atmosphere in which respect is valued, assertion training can help prevent discipline problems from occurring in the classroom. (FG)