As part of Project IMPACT's efforts to identify and develop procedures for complying with the impact requirements of Public Law 94-482, a case study was made of Illinois Projects in Horticulture. Fourteen horticulture projects in high schools and junior colleges were discovered through a previous study, personal interviews with two University of Illinois professors, and information from the State Vocational Education office. Information on the projects was obtained from project directors, a state consultant, and participating teachers. A sample of 18 schools and a junior college were visited to assess the impact of these projects on the horticulture instructors and on the horticulture programs. Although fewer than half of the teachers sampled had attended the workshops described in the 14 projects, it was found that the materials produced in the projects were circulated widely beyond workshop attendees. It was also found that the Vocational Agriculture Service's "AIDS" publication was disseminated to nearly all the teachers in the state, and that there was a need for periodic ornamental horticulture workshops since there was frequent teacher turnover in this field. Project IMPACT discovered that in quantitative terms, the greatest documented impact of the horticulture funding in the state has been the increase in the number of programs claiming reimbursements for vocational horticulture-- from just one program in 1967 to 133 in 1977--at a cost of less than $200,000. But the impact these programs have had on the knowledge, skills, attitudes, or employability of horticulture students remains an unanswered question. (KC)