This paper evaluates the Youth Awareness Program (YAP), a joint effort of District of Columbia Public Schools and the Metropolitan Police Department, which focuses on helping high school students make appropriate decisions about sex, drugs, crime, and careers and motivating students toward positive behaviors. The separate contributions of the school district and police department are outlined, and then the program, as conducted in two junior and two senior high schools and involving over 800 students, is described. Utilizing a number of strategies (including interviews, discussions, multi-media, field trips, and a variety of counseling techniques), YAP teachers and community resource representatives conducted classes twice a week throughout one semester. Program goals are detailed, and a collection of instruments is presented for: (1) evaluating the general effectiveness of the program; (2) measuring changes in the knowledge, attitude, and behavior of YAP students; and (3) gathering students' and instructors' opinions about the program. Results include student performance scores on pretests and posttests and a summary of (largely favorable) responses from YAP students, implementers, facilitators, consultants, and visiting instructors. A discussion of these findings asserts that YAP students made positive gains in both knowledge and attitudes, although some negative evaluation comments were heard. The program is found to be successful and cost-effective as presently organized. Recommendations include revision of the student behavior profile, use of machine-scored answer sheets for general student data, and formal feed-back for parents and regular classroom teachers. Appendices include the Planning, Monitoring and Implementation (PMI) Schema and Report; a list of participating schools; and a list of participating agencies and services. (KH)