Rigorous primary studies and meta-analyses have found that rehabilitative correctional interventions/treatment programs can significantly reduce recidivism. However, these same studies have found that there is a great deal of variability regarding the effectiveness of rehabilitative interventions. What does this variability mean for practice? How does the risk, needs, responsivity (RNR) model help make sense of this variability? Finally, given this reality, how should rehabilitative programs be implemented in contemporary correctional practice to maximize their recidivism reduction potential?