To help school administrators and others compare staffing patterns in their school systems with those in systems of a similar enrollment size and expenditure level, this report provides data on pupil-staff and teacher-staff ratios for individual positions and aggregate categories of professional personnel. The ratios analyzed in the report were provided by 1,111 public school systems for school year 1979-80. Definitions of staffing measures, a description of the sample design, methods of tabulation, a summary analysis, and instructions for proper use of the data precede the tables. Summary tables present the data separately for large, medium, small, and very small school systems and for five levels of per-pupil expenditure. A tabular listing of the school systems, by state, provides data on total staff employed plus staffing ratios for seven different personnel categories. (Author/MLF)