The OSAP High Risk Youth Demonstration Program of the Mississippi Band of Choctaw Indians is directed toward the prevention of substance abuse through experiences offered in an after-school program. This is the second year that the program has been implemented in the six elementary schools and one middle school of the Mississippi Choctaw reservation. In 1990-91, the project was designed to serve an estimated 610 students, although 710 were actually enrolled. The program included five components: (1) tutoring on homework; (2) drug education; (3) recreation; (4) snacks; and (5) cultural activities. The external evaluation included a review of activities, verification of data collection for internal evaluation, a review of the preceding evaluation, a summary of evaluator field visits, including interviews with teachers, principals, and parents in participating schools, and a report of observed strengths and weaknesses. In five of the seven schools, the program is being implemented with great fidelity to the model described in the funding proposal. Overall, the program is very effective. Although community substance abuse has not lessened, very few cases are found among the children. Parent and student attitudes toward the program are favorable. It is also apparent that a strong principal is the key to effective program functioning. (SLD)