Forecasting and Inventory Control for Sporadic Demand Under Periodic Review

A sporadic or lumpy demand pattern is characterized by large transactions separated by periods of zero demand. Such demand patterns occur frequently for items in parts and supplies inventory systems. A forecasting procedure is presented, to be used in conjunction with a base-stock (order-up-to) inventory-control policy under periodic review. The procedure determines the size and timing of replenishment orders. Although a base-stock policy calls for a replenishment order after each transaction, it is shown that a delay in placing the order can result in significant holding-cost reductions with little additional risk or cost of stockouts.