The purpose of this book is to assist libraries and librarians in resolving some of the problems faced in utilizing the new computer technology. The intent is to provide a concrete, factual guide to the principles and methods available for the application of modern data processing to library operations. For the librarian it is a handbook to guide him in decisions concerning the introduction of data processing techniques into his own library. For the student it is a textbook, educating him in the methodology and the interrelationships between data processing and the library. For the system designer it is a summary of the state-of-the-art serving as a bridge between library objectives and the technology. The book stresses particularly the significance of library values and policies for determining the choice of system. The emphasis given to the computer is always in the context of applying this technology to the solution of operation problems, as an addition to resources for information service and as a tool of good management, not as an end in itself. The book is organized into five major sections: (1) Introduction to Library Data Processing, (2) Management of Library Data Processing, (3) Data Processing Technology, (4) Library Clerical Processes and (5) Library Intellectual Processes. Each chapter within a section presents a principal topic of interest and is followed by an annotated bibliography and additional recommended reading. (NH)