Project Yaqui is a model program to identify and provide intervention for handicapped Native American preschool children. Founded on acceptance of the cultural rules and expectations of the tribal community, the project has five major program components: (1) direct service to children; (2) parent, family, and community involvement; (3) interagency cooperation; (4) development of culturally and linguistically appropriate procedures and materials; and (5) staff training and technical assistance. This report for fiscal years 1981-84 includes program philosophy and rationale, numerous measures of the effectiveness of major program components, budget analyses, and a summary of program dissemination activities. Extensive, detailed information is included in pre- and posttesting and developmental progress of children in the two direct service programs--a preschool for 3-5 year olds and a parent-child program for 1- and 2-year-olds. The child development assessment tools include forms in Spanish and Yaqui. Appendix 1 includes the daily schedule for the preschool, the needs assessment form for parents and families of handicapped children and copies of the record forms for individual children. Appendix 2 contains culturally based curriculum materials that include numerous pictures identified with the Yaqui culture. (JHZ)