The quasi-experimental design allowed assessment of whether the addition of day reporting to ISP affected recidivism rates after controlling for personal and legally relevant characteristics. The 1,026 study participants included all 875 offenders sentenced only to ISP between October 1, 1995 and May 31, 1998 and the 151 offenders sentenced to the Day Reporting Center plus ISP during the same time period. The research examined whether the offender was rearrested for a nontraffic offense as of May 31, 1998. The addition of a Day Reporting Center to ISP did not significantly reduce the rate of rearrest. It is possible that increased surveillance of offenders sentenced to both day reporting and ISP counterbalanced any rehabilitative effect of the Day Sentencing Center due to the effect of piling up of sanctions as discussed by Blomberg and Lucken in 1994. However, the Day Reporting Center empowers offenders by offering literacy courses, high-school equivalency, drug treatment counseling, and anger management classes, regardless of its effect on recidivism. Overall, several issues require resolution before conclusions regarding the effectiveness of day reporting or any other immediate sanction are possible. Tables, figures, and 15 references