Operations Management: Processes and Supply Chains, 12th Edition
by Lee J. Krajewski, Manoj K. Malhotra, Larry P. Ritzman
Periodic Review System
An alternative inventory control system is the periodic review (P) system, sometimes called a fixed interval reorder system or periodic reorder system, in which an item’s inventory position is reviewed periodically rather than continuously. Such a system can simplify delivery scheduling because it establishes a routine. A new order is always placed at the end of each review, and the time between orders (TBO) is fixed at P. Demand is a random variable, so total demand between reviews varies. In a P system, the lot size, Q, may change from one order to the next, but the time between orders is fixed. An example of a periodic review system is that of a soft-drink supplier making weekly rounds of grocery stores. Each week, the ...
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