A model for statewide evaluation of Acquired Immune Deficiency Syndrome (AIDS) prevention education program in Idaho secondary schools was developed and implemented. Focus was on gathering the following data: the number of public schools implementing AIDS prevention education programs; the number of public schools where AIDS prevention education is part of a comprehensive health program; the percentage of students who have received AIDS prevention education; levels of AIDS knowledge and attitudes of students in grade 8 and high school; and levels of AIDS knowledge and attitudes of school personnel. The study included five data collection components: (1) a statewide survey of 100 of the 115 Idaho school districts; (2) a survey of 7,776 eighth-graders and senior high school students from 24 Idaho schools; (3) a survey of 32 school administrators, 16 school counselors, and 615 teachers; (4) on-site interviews with administrators, teachers, and school board members from schools in the student and personnel surveys; and (5) an analysis of curriculum materials used by the sample schools in conjunction with HIV/AIDS prevention education. Only 58% of the districts had an approved AIDS prevention education plan; less than half had integrated the information into a comprehensive plan. Surveys indicated that topics related to AIDS prevention were taught less often and later than teachers thought they should be. Findings highlight the progress made in Idaho as well as the need to align the AIDS curriculum policy with classroom practices. Five tables contain study data. (SLD)