The study found evidence of a link between program characteristics and its effectiveness in reducing recidivism. All of the programs were supervision-based and adhered to some degree to the principles of matching program features to the risk and need characteristics of the offender. These intensive supervision programs were more successful for the higher risk offenders. When at least 75 percent of the population supervised was classified as high risk, there was a 5-percent decrease in recidivism. This compared with a slight increase in recidivism for programs that served more low-risk offenders. Programs that required higher risk offenders to be in the programs for a longer period had a 4-percent reduction in recidivism. Those programs that had a "one-size-fits-all" approach had no effect on recidivism. Programs that had more referrals for higher risk offenders reduced recidivism by 7 percent. Programs that did not have more referrals for this population had a marginal reduction in recidivism. Programs in which 75 percent or more of the referrals were for treatment programming had an 11-percent reduction in returns to prison. Programs in which more than 25 percent of their referrals were nontreatment increased recidivism by 3 percent. Based on these findings, it is evident that programs tailored to prominent risks and needs of offenders achieved significant reductions in recidivism. The study examined 66 community-based jail and prison diversion programs in Ohio. Offenders served by these programs were compared to offenders who were processed as usual in jail, municipal probation, or prisons. A total of 5,781 prison diversion cases were compared to an equal number of parolees. A total of 707 comparison cases were used as a matched sample for the jail diversion programs. 2 tables, 2 figures, and 26 references