Intended to make possible the comparison of staffing patterns in one school system with those in systems of similar enrollment size and expenditure level, this report was developed through a national survey conducted in 1983-84 of 1,217 school systems. Included are pupil-staff and teacher-staff ratios for individual positions and aggregate categories of professional personnel. Tables present data separately for large, medium, small, and very small school systems and for five levels of per pupil expenditure of the reporting schools systems, showing means, ranges, and percentile distributions. Ratios contained in the report include the number of pupils per teacher, counselor, librarian, and school nurse. The report also contains individual ratios both of pupils and of teachers to school building-level professional staff members, principals, assistant principals, school building-level administrative staff members, central office professional staff members, and teacher aides. (MCG)