Approximately 1,700 offenders were accepted for supervision during the target period. Of the 755 cases actually examined, information collected on each offender included demographic data, criminal history, needs assessment, initial risk assessment and reassessment, supervision outcome, and 3-year follow-up. Findings showed 23.2 percent of the 755 cases had an unsuccessful supervision outcome (technical violators, new crimes while under supervision, and violators at large). Subgroups exhibiting higher supervision failure rates were males, nonwhites, offenders in the 21-30 age group, parolees, offenders convicted of property offenses, and offenders initially assigned to the maximum level of supervision. In terms of criminal behavior while under supervision, subgroups exhibiting higher failure rates were those arrested or convicted, offenders who received some type of criminal sanction on supervision (jail time, fines, or probation), and offenders who absconded or were recommended to be declared technical violators. All individual items in the initial risk assessment instrument and most items on the initial needs assessment instrument were clearly associated with failure rates in expected ways; as the values of variables increased in risk or need, the likelihood of successful outcome decreased. The exception to this pattern was the needs assessment item dealing with financial management which did not appear to be associated with supervision outcome. Supplemental data on study findings are contained in an appendix. 13 tables