The proposed psychological intervention model focuses on changing the inmate's broad world view of the inmate rather than on the achievement of specific insight or the conditioning of particular behaviors. In addition, it offers a moral ideology considered more just than that implicit in psychological interventions used in the past. The concepts underlying the proposed model have been developed by Dewey (1933), Mead (1934), and Piaget (1969). The model is based in the concept that persons develop through an invariant sequence of stages which organize their perceptions of physical reality as well as conceptions of relationships with social others and the institutions of society. Moral judgment is classified in the following stages of development; (1) moral value resides in external quasi-physical happenings, in bad acts, or in quasi-physical needs rather than in persons and standards; (2) moral value resides in performing good or right roles, in maintaining the conventional order and the expectations of others; and (3) moral value resides in conformity by the self to shared or shareable standards, rights, or duties. In the experimental application of the model in a women's prison, cottage self-government was used as the basic structure for stimulating development of residents through the foregoing moral stages. Progress was seen in measuring change in moral development and in the rate of recidivism for participants after release. A preliminary recidivism count after a mean of 1 year showed that only 5 of 33 inmates had returned to prison. This compared favorably with statewide norms for female felons. A list of 24 references is provided.