The Oxnard (California) Community Mental Health Center reports on evaluation of efforts to train parents in child management skills using behavior modification techniques. Rigorous training procedures, curriculum, and evaluation techniques have been developed over the past two years. Twenty groups of 3-15 parents have received training in behavior modification during 10 sessions led by mental health technicians. The paper emphasizes the importance of evaluating program outcome in terms of multilevel sources of data if the workshop format is to continue as a viable approach to child therapy. Accordingly, evaluation of program progress encompasses the traditionally defined process variables such as attendance, participation by parents in workshops sessions, and characteristics of leadership behaviors of the trainers. In addition, the evaluation of parent training as outlined in this paper is in terms of what parents do, rather than what they talk about doing. Therefore, the effects of the training program are evaluated in workshop role-playing sessions, and later by home and phone contacts. Finally, the paper suggests that the impact of parent workshops should be assessed in terms of the reduction of delinquency rates, admissions to residential treatment facilities for children, and dropout rates. (CS)