Behavioral changes cannot occur without the subject's using internal self-discipline. The use of a consistent and carefully planned system of discipline in a treatment program is the only way to encourage the development of responsible behaviors in youth who habitually harm others. Being responsible requires making decisions and living with the consequences of the decisions. At the Closed Adolescent Treatment Center, a long-term intensive treatment program for violent delinquents in Colorado, these concepts form the basis of the program. Alternatives to punishment are emphasized, due to the unpredictable consequences of punishment in some situations. The expectations and consequences are clearly specified. The positive peer culture sets the behavioral standards, although this process is guided by staff and occurs within the structure of the overall treatment program. The three basic systems of discipline are the checking and booking system, time out, and team demotions. Within the basic program structure, techniques used to achieve flexibility include firm limits on behavior, the provision of options in disciplinary situations, the involvement of peers in consequences of misbehavior, and occasional withdrawal from power struggles. Staff attitudes, the use of stress management techniques to support staff, and the use of reinforcement along with discipline are also crucial ingredients of the program. Three references are listed.