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A Management Information System has been developed and implemented using General Purpose Simulation System (GPSS)/360. The system provided the following data for a solid-state production facility: 1) current location of wafers showing work orders started, total daily production, and rejects; 2) yesterday's and accumulated yield by step, and projection of number of finished wafers from this quantity; 3) location of dormant work orders, i.e., orders that had not moved for a specified time; 4) current utilization of equipment and manpower; 5) number of orders awaiting processing at each step and how long they have been waiting; 6) daily operations schedule of wafers to be processed each day according to a predetermined priority structure; and 7) delivery forecast for when orders would be shipped and how the date varies according to resources applied. The inventory status data were structured in GPSS/360 to provide a common data format for both current status and forecasting. This fully operational system was developed to satisfy specific solid-state management requirements. This system was organized in a general manner for flexibility and change and could be modified to be used as a management information system for other types of operations.