This research was designed to determine whether the supervision of misdemeanant probationers was cost-effective for increasing the level of successful probation completions in Hamilton County, Ohio. The primary objective was to examine the relationships among these factors: supervision costs, the collection of court costs, fines, and restitution, types of supervision, risk assessment, and probationer conduct for the population of probationers. Probationers were initially classified according to risk assessment and then randomly assigned to a supervision category. The probationer's risk potential was a numerical score derived from demographic background variables, prior record, and history of substance use. The DSCP (Degree of Successful Completion of Probation) was developed specifically to measure probationer conduct and to compare trends and relationships. The variables examined in the study include: risk assessment at intake, supervision level assigned, number of times the probationer was assigned to probation, start and planned termination dates, date of last status change, status at termination, degree of successful completion of probation achieved, costs incurred in administering probation, and amounts collected from each probationer for court costs, restitution, and fines. Although data were collected on 7,072 misdemeanant probation experiences, there are only 2,756 probationers included in the study. The remaining 4,316 cases were excluded due to failure of the probationer to show up for screening or for other reasons that did not meet the research criteria.