In late 1993, the Oklahoma Department of Corrections implemented Moral Reconation Therapy (MRT), a cognitive behavioral treatment program. Outcomes of individuals who participated in the MRT program were compared to individuals who participated in other correctional programming such as education and job training sessions, and individuals who did not participate in any programming. The longitudinal nature of the analysis also facilitated an examination of behavior changes within individuals before and after they initiated program involvement. The decision to participate in MRT and other programs was correlated with a number of individual characteristics; treatment effects and factors that led to program initiation were difficult to disentangle. Among individuals who initiated MRT, program involvement was associated with moderate but statistically significant reductions in the risk of misconduct and recidivism incidents. Notes, references, tables, figures, appendixes