This is the fourth biennial study of instructional costs for state institutions of higher education, and is the basis for the higher education commission's development of budget formulas. The basic unit of measurement is the student credit-hour; professional salaries, support salaries, operating expenses, and equipment charges are allocated to the credit-hour so as to yield costs per hour by academic program, course level, and institution. Statewide average costs are computed by student credit-hour, program, and level (freshman/ sophomore, junior/senior, master's, and doctoral). (Author/MSE)