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The reorder point (ROP), also reorder level (ROL) or "optimal re-order level", [1] is the level of inventory which triggers an action to replenish that particular inventory. It is a minimum amount of an item which a firm holds in stock, such that, when stock falls to this amount, the item must be reordered.
Prior to MRP, and before computers dominated industry, reorder point (ROP)/reorder-quantity (ROQ) type methods like EOQ (economic order quantity) had been used in manufacturing and inventory management. [1] MRP was computerized by the aero engine makers Rolls-Royce and General Electric in the early 1950s but not commercialized by them.
Reorder level: Reorder level refers to the point when a company place an order to re-fill the stocks. Reorder point depends on the inventory policy of a company. Some companies place orders when the inventory level is lower than a certain quantity. Some companies place orders periodically.
If there are backorders, the reorder point is: =; with m being the largest integer and μ the lead time demand. Additionally, the economic order interval [ 8 ] can be determined from the EOQ and the economic production quantity model (which determines the optimal production quantity) can be determined in a similar fashion.
Total cost function and optimal reorder point. The total cost is given by the sum of setup costs, purchase order cost, backorders cost and inventory carrying cost:
The MRP II system integrates these modules together so that they use common data and freely exchange information, in a model of how a manufacturing enterprise should and can operate. The MRP II approach is therefore very different from the "point solution" approach, where individual systems are deployed to help a company plan, control or manage ...
In addition, ERP systems use established formulas to help calculate appropriate levels of safety stock based on the previously developed production plans. While an ERP system aids an organization in estimating a reasonable amount of safety stock, the ERP module must be set up to plan requirements effectively. [5]
Reorder point – Inventory level triggering replenishment Inventory control system – Ensuring the correct level of stock Pages displaying short descriptions of redirect targets Extended newsvendor model – Mathematical model to assist inventory levels Pages displaying short descriptions of redirect targets