A cost/benefit analysis of the Public Library Automation Network (PLAN) project was undertaken to evaluate those areas in library technical processing impacted by BALLOTS: searching the data base for catalog copy; cataloging with MARC or original catalog copy input by participating libraries; data entry of original records and modification of existing records for the production of catalog cards or tape output to interface with other systems; and processing instituted in the libraries for catalog card handling or proofreading and edit procedures. Significant findings indicated that libraries were able to shift a significant portion of costs (for functions studied) from personnel expenses to contracted computer-based services; the system was at least as effective as previous systems employed by the libraries; the system supported an increase in production workrate and a decrease in processing calendar time requirements; no significant staff problems or obstacles were discovered in the use of the BALLOTS terminal; and in general, modification of a library's internal operating system to utilize BALLOTS did not present significant planning or management problems. System benefits and problems are identified and discussed. All data collected on computer use represents BALLOTS in LINE MODE operating at 30 characters per second. Data on past system monthly operating costs, BALLOTS system monthly operating costs, cost differences, and projected cost over seven years are presented in tabular form. (JPF)