This paper discusses the importance of incorporating the parents of the child with behavior problems into the treatment process by teaching them behavior modification principles. It points out that trained parents augment the likelihood of producing long-lasting positive effects in their children and of extending their influence to other current as well as future difficulties; also, by teaching parents, the professional broadens the opportunities he has for helping others. Preceding the discussion of parent teaching is an examination of what constitutes behavior problems and how these difficulties can be assessed. Behavior modification can best be discussed as a process for ameliorating the socially relevant problems of people. It deals basically with objectively defined and observable behavior occurring as a function of antecedent and consequent environmental events. These environmental events are the crucial independent variables that must be manipulated in order to produce critical