This investigation sought to extend that literature by examining how affective changes are integrated into the general personality structure of peer group program participants. The study supports the hypothesis that self concept enhancement may be a by-product of a more general cognitive restructuring: an offender's active endorsement of socially appropriate values as well as personal and interpersonal competence may precede improved feelings of self worth. These findings are discussed in relation to both the theoretical assumptions of peer group treatment and individual personality development. (Author abstract)