REINFORCEMENT AND ROLE-REVERSAL TECHNIQUES ARE USED IN THE SCORE PROJECT, A LOW-COST PROGRAM OF DELINQUENCY PREVENTION FOR HARD-CORE TEENAGE STREET CORNER BOYS. COMMITTED TO THE BELIEF THAT THE BOYS HAVE THE POTENTIAL FOR ETHICAL BEHAVIOR, THE SCORE WORKER FOLLOWS B.F. SKINNER'S THEORY OF OPERANT CONDITIONING AND REINFORCES THE DELINQUENT'S GOOD BEHAVIOR THROUGH REWARDS. FUTHERMORE, THE WORKER IN THE USE OF ROLE-REVERSAL TECHNIQUES MAKES THE DELINQUENTS RESPONSIBLE FOR REDUCING CRIME IN THE COMMUNITY. HOWEVER, THE SCORE WORKER DOES NOT AIM TO ACHIEVE PERSONALITY CHANGE OR COMMUNITY SPIRIT. SCORE PROJECTS BEGIN WITH PRIVATE OR COMMUNITY SUPPORT AND A SURVEY OF THE TEENAGE CRIME RATE IN THE AREA. LIAISON WITH THE POLICE IS IMPORTANT AT THIS POINT FOR VERIFYING OFFENSES, DETERMINING THE PATTERN, AND LOCATING THE HARD-CORE OFFENDERS. SUCH INTERVENTIONS AS OFFERING FREE COFFEE AND DONUTS DURING HIGH CRIME HOURS AND GIVING THE BOYS A CHANCE TO EXPRESS AGGRESSION "SAFELY" ARE USED IN THE BEGINNING OF THE PROGRAM. BASED IN A STOREFRONT OR LOFT. THE WORKER LATER PAYS THE BOYS FOR DESIRABLE BEHAVIOR AND COOPERATES IN FINANCING CONSTRUCTIVE ACTIVITIES. IMMEDIATE AVAILABILITY OF FUNDS IS ESSENTIAL FOR CARRYING OUT THESE ACTIVITIES. (NH)