This volume is designed to be a comprehensive guide to the evaluation and use of computers and modern data processing systems in libraries. It is organized into four sections, each covering a major facet of library automation. Part 1 provides a mechanized introduction to library data processing, including its benefits and costs, a review of its usefulness in decision making, and cost accounting. Part 2 presents the systems approach to development and evaluation of applications to library data processing--necessary flow charts, systems budgeting, staffing, programing, phase-over, and orientation. Part 3 is designed to introduce computer technology including machine language, computer hardware and software, and evaluation criteria. In part 4, the various library subsystems are analyzed, and operational examples are described--administration, ordering, cataloging, circulation, serials, interlibrary loans, and information services. A glossary and references are provided. (Author/SL)