A batch-mode, computer-based, serials system was developed for the bio-medical library, a departmental library at the University of Minnesota. Patterned after the "arrival card" system now in use in several libraries, it is designed so that serial check-in is done by marking off the issue on a printed list of serial issues expected during the month, based upon predictions made by the computer. Any gifts or unexpected issues or supplements (about 20% of the total) which do not appear on the check-in list are handled by use of a serial check-in form. This information is added to the master file and at the end of the month corrections to the prediction codes, if necessary, are made. Other monthly printouts are: (1) a serials master list which contains all the information collected about each serial title (7800 in all), (2) a patron holdings list, a list to be used by patrons containing less information than the previous list, and (3) bindery list of items for which volumes are completed. The first two lists are supplemented by daily cumulative supplements prepared from the daily input cards made when a serial issue arrives. A cost analysis made in connection with the pro ect shows that the average cost per transaction is $0.71 in the new system. (CM)