The purpose of this report is to provide school administrators, school board members, and others with accurate, timely, and reliable data useful in comparing staffing ratios in school systems of similar enrollment size and expenditure level. Included in the report are 1977-78 pupil-staff and teacher-staff ratios. These data are presented separately for large, medium, small, and very small school systems and for five levels of current expenditure per pupil. The report also contains a tabular listing of specific staffing data and per pupil expenditure supplied by each reporting school system, with school systems listed alphabetically by state. Information listed was gathered from a questionnaire mailed to 1,918 school systems. Although no attempt was made to estimate national averages, a number of summary analyses were calculated. The mean number of pupils per teacher in reporting school systems was 20.3, ranging from 18.6 in very small school systems to 21.4 in medium school systems. For example, the mean number of pupils per total administrative staff member was 249.6, ranging from 224.1 in very small systems to 258.2 in large systems. (Author/JM)