Conduct disorder (CD) consists of behaviors at variance with societal expectations and which are clearly aversive to both children and adults. Examples of this type of behavior are disobediences, fighting, destructiveness, jealousy, and assaultiveness. Personality disorders (PD), in contrast, have little negative effect on the child's environment. Social withdrawal, shyness, seclusiveness, lack of self confidence, and an inability to have fun are examples of this type of behavior. The Inadequacy-Immaturity (II) syndrome represents the third type of deviant behavior, and includes behaviors such as preoccupation, clumsiness, and excessive giggling. Socialized or subcultural delinquency (SD) represents personal distress or maladaptive behaviors such as gang activities, cooperative stealing, and street culture participation. Various types of behavioral modification programs have proved successful in changing these behaviors in the school setting. Using least restrictive environment' such as use of a resource room where students can spend part of the school day, rather than using the closed classroom as the primary teaching environment, has also proved effective. Forty-six references are included.