This study was conducted to test measures of library service developed in a 1974 national performance measurement study, and to develop personnel training programs in data collection and analysis in New Jersey public libraries. The study was conducted in three phases: (1) revision of original procedures manual; (2) measurement implementation in 25 libraries with total expenditures greater than 100,000 dollars; and (3) implementation in 16 libraries with expenditures of 100,000 dollars or less. Materials availability and usage, facility and equipment usage, and staff availability data were collected. Performance results of different measures showed interlibrary loan circulation, and facility availability and usage need further definition. Title availability, in-library circulation, staff assistance patterns, and user characteristics provided much information for decision making. The study concluded that data collection and tabulation can be performed successfully by librarians in public libraries of any size. The New Jersey State Library were to: (1) conduct further research and analyze data for norms; (2) require inclusion of measures in library annual reports; and (3) support continuing education in using the method. Appended is a report on the public use of academic libraries. (KP)