| Available to promise | A feature of MRP systems that identifies the difference between the number of units currently included in the master schedule and the actual (firm) customer orders.
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| Bill-of-Materials (BOM) | The complete product description, listing the materials, parts, and components; the quantity of each item; and also the sequence in which the product is created.
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| Master production schedule (MPS) | A time-phased plan specifying how many and when the firm plans to build each end item.
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| Material requirements planning (MRP) | The logic for determining the number of parts, components, and materials needed to produce a product.
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| Net change systems | MRP systems that calculate the impact of a change in the MRP data (the inventory status, BOM, or master schedule) immediately.
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