Evidence-based and research-based programs to be used by adult corrections in Washington State are inventoried. Three parts comprise this report: definitions-evidence-based, research-based, and cost-beneficial; updated reviews using a three-step research process (evidence, benefits and costs, and risk), effective practices in community corrections, sex offender treatment, and conclusion; and the inventory. “WSIPP identified two programs-sex offender treatment and EPICS-that were not previously included in WSIPP’s evidence- and research-based results. Our updated findings on the two topics in this report allowed us to incorporate the results in the adult corrections inventory. The weight of the evidence indicates that sex offender treatment, delivered in confinement or in the community, is evidence-based and generates benefits that exceed costs. Our findings on EPICS [Effective Practices in Community Supervision], however, are not as clear cut. While we find supervision based on RNR principles is effective, the evidence on the particular approach-EPICS-is still undetermined until further research becomes available” (p. 5-6).