The Other Way (TOW) program is an intensive residential substance abuse treatment program housed at the Clarinda Correctional Facility in Clarinda, Iowa. TOW is a voluntary, six-month program that works with inmates to identify the causes of their addictive behaviors and encourage changes in unacceptable behaviors and criminal thinking. The Iowa Consortium for Substance Abuse Research and Evaluation conducted an evaluation of TOW from October 1997 through March 2001. The Iowa Consortium worked extensively with the Clarinda TWO treatment staff to identify valid and reliable instruments that measured substance use and abuse, mental health and personality characteristics, criminal behavior and attitudes, social support, and involvement in education, employment, and therapeutic activities. These instruments were used to collect data at intake and discharge. Additionally, the researchers conducted a six-month follow-up of inmates to determine their post-program experiences as well as recidivism. Part 1 (Clinical and Recidivism Data) consists of selected variables gathered during the clinical interviews administered to program participants at intake and discharge, as well as recidivism data from the Department of Corrections. Part 2 (Follow-Up Data) consists of variables from the Addiction Severity Index, which were collected during the six-month follow-up telephone interview.