This study examined the impact on reconviction of appropriate allocation to three general offending behavior programs involving adult male offenders in the English and Welsh Probation Service. Appropriate allocation was defined by level of risk for reconviction. There were three allocation groups: too low, appropriate, and too high. Using a quasi-experimental design, the reconviction rates of offenders who were allocated to and completed a program, offenders allocated to a program who failed to start, and a comparison group were compared. It was found that the appropriateness of allocation affected reconviction independently of treatment group. Furthermore, in line with the risk principle, there was an interaction between treatment group and the appropriateness of allocation.