This report contains a series of recommendations for a uniform statistical report system for Pennsylvania public libraries, based on the assumption that many of the procedures in library work can be quantified in a meaningful manner. The types of data needed for the Commonwealth, individual library use, local reporting, and for research purposes are considered, and emphasis throughout the entire reporting system is on data that is meaningful to an informed lay group. Recommendations cover: classification of libraries, population served, cardholders, characteristics of the collection, reference material and questions, periodicals, staff, physical facilities, financial reporting, extension and school service, federated and county systems, and well-researched special reports emphasizing textual interpretations of statistics to be undertaken by the State Library. Regular reporting of circulation data is not recommended. Appended are notes on use of the reporting system for extension service statistics, the methodology used for the report, and a sample list of columnar headings for a state statistical report on public libraries. (JB)