The IBM Business Management Series (BMS) is an IBM PC based accounting package targeted at small and medium sized businesses. It consists of six modules, or as IBM called them "editions": Inventory Accounting, Order Entry and Invoicing, Accounts Receivable, Payroll, Accounts Payable, and General Ledger. The system can be used with any single module, or multiple modules can work together. The Business Management Series can interface with the Personal Decision Series. It was criticized as being too costly, bloated, and overly complicated.