This paper is a systematic attempt to apply the principles and techniques of behavior modification to process and outcome in group therapy. The framework is derived from learning theory, and is aimed at providing a conceptual model for the understanding and practice of group therapy in which symptom redress is the primary goal. A number of promising therapeutic strategies and techniques evolved directly from the application of a behavioral methodology to groups. These strategies and techniques are presented in the -- the development of group cohesiveness, assessment, and intervention. Particular emphasis is placed upon the crucial role of thorough and ongoing assessment. Intervention is comprised of five major therapeutic thrusts, as follows: A.) engaging in graded behavioral tasks both inside and outside the group; B.) training in self-change strategies and techniques; C.) enhancing client motivation and participation in therapy; D.) using group members as therapeutic change agents; and E.) ensuring generalization of newly learned behaviors from the safe confines of the group to the world outside. The advantages and limitations of this approach to group therapy were discussed. (Author)