An integrated data base system providing online services to purchasing and accounts payable, which was implemented at the University of Michigan, is described. The system was designed to use online IMS transactions for data entry and inquiry and IMS batch reporting programs. With the implementation of the system, departmental and vendor inquiries are answered more quickly and with greater accuracy, and invoices are paid more promptly. There is more rigorous control and application of credit memos on a university-wide basis, and the accumulation of statistical data has provided management the tools necessary to direct the efforts and measure results in purchasing and accounts payable. Duplicate files have been eliminated, and clerical effort has been substantially reduced. The security and controls built into the system have made unauthorized purchases and payments much more difficult. Data base and file descriptions and an overview of the way the system works are presented. A schematic diagram of the system is included. (SW)