Designed for use by study coordinators, library supervisors, and data collectors, this manual is the basic reference and training document from the 1982 field survey of public online catalog users and nonusers in 31 U.S. research, academic, community college, public, and governmental libraries. The field survey was coordinated by the Research Libraries Group (RLG) and four other organizations. The manual's first chapter gives general information about the study. Its second chapter is addressed to data collectors and provides guidelines for recruiting computer catalog users and nonusers. Included are a list of data collector responsibilities, a sampling schedule, and specific instructions for preparation, filling in forms, dealing with various types of user and nonuser prospects, and checking completed questionnaires for correct marking. A final chapter highlights the responsibilities of study supervisors, particularly in selecting and training data collectors, controlling questionnaires and other study materials, maintaining quality control of data collection, and making weekly reports to the study coordinators. Appendices comprise samples of a study information sheet for use during the field survey, a time block summary sheet for use by data collectors, a supervisor's weekly report form, list of key points for data collectors and study supervisors, and scripts for use in user and nonuser data collection. (ESR)