Aggressive and violent behaviors are increasing among children and youth in America's schools. Although many children and adolescents occasionally exhibit aggressive and sometimes antisocial behaviors in the course of development, an alarming increase is taking place in the significant number of youth who confront their parents, teachers, and schools with persistent threatening and destructive behaviors. Students who exhibit chronic patterns of hostile, aggressive, and defiant behaviors frequently are characterized as having oppositional disorders or conduct disorders (Kazdin, 1987; Home & Sayger, 1990), and their behaviors are increasingly identified as antisocial (Walker, Colvin, & Ramsey, 1995). The Diagnostic and Statistical Manual of Mental Disorders (DSM-Ill-R) (American Psychiatric Association, 1987) defines oppositional defiant disorder as a pattern of negativistic, hostile, and defiant behavior. ... Children with this disorder commonly are argumentative with adults, frequently lose their temper, swear, and are often angry, resentful, and easily annoyed by others. They frequently actively defy adult requests or rules and deliberately annoy other people. They tend to blame others for their own mistakes or difficulties. (p. 56) Conduct disorder, a more serious and disruptive aggressive behavior pattern, is defined in the DSM-III-R as a persistent pattern of conduct in which the basic rights of others and major age-appropriate societal norms or rules are violated .... Physical aggression is common. Children and adolescents with this disorder usually initiate aggression, may be physically cruel to other people or animals, and frequently destroy other people's property. (p. 53) Antisocial behavior has been defined as "recurrent violations of socially prescribed patterns of behavior" (Simcha-Fagan, Langner, Gersten, & Eisenberg, 1975, p. 7), and antisocial patterns of behavior have been described as the polar opposite of prosocial patterns, which are composed of cooperative, positive, and mutually reciprocal social behaviors (Walker et al., 1995). According to Walker et al., "Antisocial behavior suggests hostility to others, aggression, a willingness to commit rule infractions, defiance of adult authority, and violation of the social norms and mores of society" (p. 2).