This study analyzes and reports the various methods public school systems use to schedule salaries for supervising principals. No attempt is made to prescribe or recommend procedures for scheduling salaries; rather, present practices are identified, described, and analyzed. Some unusual practices are included. For example, the procedure of relating the salary schedule for principals to the salary of the school superintendent rather than to the salaries of teachers. In general, there are four major components of the salary schedules analyzed in this study: (1) base for the schedule, (2) structure of the schedule, (3) incremental pattern of the schedule, and (4) advancement on the schedule. The extensive statistical data covers 272 public school systems with enrollments of 300 or more. (Author/IRT)