Free source code (OpenVMS COBOL) and documentation files of IFOP, a customized MRP II application (Manufacturing Resource Planning). IFOP works on any platform that supports OpenVMS (including PCs running hardware emulation software). This is a fully integrated and self-contained system, with hundreds of interrelated functions for production, sales, shipping, EDI, quotations, lot management, quality assurance, product costing, machines and tooling, preventive maintenance, inventory and warehousing, raw materials, purchasing, and accounting. IFOP has been used and improved for many years. It is customized for a manufacturer of industrial fasteners from Ontario, Canada, whose products are used mostly in the North American automotive industry. Although designed for a specific industry and a specific company, IFOP can be useful in many other situations. Some parts are generic in nature and can be incorporated with only a few changes in other applications. And, with a reasonable amount of work, many functions can be adapted for other business needs or other platforms. At the very least, IFOP demonstrates some important programming concepts for developing and maintaining sophisticated, customized business applications.