The Youth Development Project is a school-based delinquency prevention project which incorporates intervention strategies of social skills training, student team learning, and community liaison between home and school. Subjects in the project are fourth, fifth, and sixth graders of one experimental (N=315) and one comparison (N=196) elementary school in Hilo, Hawaii. Data were collected from: (1) surveys and questionnaires completed by teachers, students, and parents; (2) direct classroom observations of students' time on task, disturbing others, and interactions with teachers and peers; (3) archival data from school records on absenteeism, tardiness, disciplinary referrals, and grade point average (GPA); and (4) anecdotal information from teachers and parents. The results revealed no strong relationship between the intervention and the dependent variables of classroom behavior, GPA, disciplinary referrals, and self-concept. Anecdotal and survey data from parents, teachers, and students did, however, indicate that social skills training and student team learning were useful school activities. Despite numerous problems with internal validity, the Youth Development Project may contribute valuable information to the understanding of delinquency prevention. Within the text there are many tables analyzing survey results and numerous figures (bar graphs). The appendixes consist of student, teacher, and parent surveys; classroom observation procedures; and a summary of narrative responses from the teacher survey. (NB)