Elements of an MRP System Customers' Inventory Forecasts orders Engineering transactions changes Inventory status Master production file (finished items, schedule (which Bill-of-materials file work in progress, products to produce,in (product structure planned orders) what quantity,and when) and routing) MRP system Planned schedules and various other reports Elements of an MRP System Inventory  transactions  Customers’  orders  Forecasts Engineering changes  Master production  schedule (which  products to produce, in  what quantity, and when)  Bill­of­materials file  (product structure  and routing)  Inventory status  file (finished items,  work in progress,  planned orders)  Planned schedules and various  other reports MRP  system