Minimum Maximum Technique: The minimum maximum system is often used in connection with manual inventory control systems. The minimum quantity is established in the same way as any re order point. The maximum is the minimum quantity plus the optimum lot size. In practice a requisition is imitated when a withdrawal reduces the inventory below the minimum level and the order quantity is the maximum minus the inventory status after the withdrawal. If the final withdrawal reduces the stock level substantially below the minimum level the order quantity will be higher than the calculated EOQ.
The effectiveness of a minimum maximum system is determined by the method and precision with which the minimum and maximum parameters are established. If these parameters are based upon arbitrary judgments with a limited factual basis the system will be limited in effectiveness. If the minimum maximum are based on an objective rational basis the system can be very effective.