ISP caseloads are limited to 25 clients, and a wide range of sanctions and controls are enforced. Probation and parole conditions limit residence locations, movements, and personal contacts. Alcohol and nonprescription drug consumption are prohibited, and participation in treatment programs is required. Of the 400 offenders received by the ISP from September 1984 through August 1985, only 3 were returned to prison for a new felony conviction, and one of the convictions was for an offense committed while not under the ISP program. Eighty-six percent of participants were employed or attending school. Eighty-three percent were still active in the program as of November 1985 or were transferred to regular supervision after successful completion of the ISP. Seventeen percent have been returned to prison, all but three on technical violations. 4 footnotes and appended eligibility criteria, ISP procedures, and an application for enrollment. (Author abstract modified)