Background Littlefield Laboratories (LL) has opened another lab. The new lab uses the same process as the lab in the assignment Capacity Management at Littlefield Labs neither the pro- cess sequence nor the process time distributions at each machine have changed. On day 0, the lab began operations with three preparers, one tester, and one centrifuge, and an inven- tory of 160 test kits. This left the lab with $1,000,000 in reserves. Customer demand con- tinues to be random, but the long-run average demand will not change over the products 268-day lifetime. At the end of this lifetime, demand will end abruptly and lab operations will be terminated. At this point, all capacity and remaining inventory will be useless, and thus have no value. Management would like to charge the higher prices that customers would pay for dramati- cally shorter lead times. However, historic lead times often extend into several days, so management has been unwilling to quote the shorter lead times. Operations Policies at Littlefield LT uses a Reorder Point / Order Quantity raw material purchase policy. That is, test kits are purchased as soon as the following three criteria are all met: (1) the inventory of test kits is less than or equal to the reorder point, (2) there are no orders for kits currently out- standing, and (3) the lab has sufficient cash to purchase the reorder quantity. No order is placed if any of these three criteria are not met. So, for example, a team could prevent kit orders from being placed at all by setting the order quantity so high that there is insuffi- cient cash to place an order. A reliable supplier delivers exactly the order quantity of kits, four days after the order is placed and paid for. Management considers physical cost of holding kit inventory negligi- ble compared to the financial costs. Other details concerning the purchasing policy can be found in the Littlefield Labs Overview note. The current reorder point and reorder quantity can be changed by clicking on Edit Data on the Materials Buffer icon.

Customers are willing to pay a premium for fast lead times, and you now have three pric- ing contracts to choose from: price = $750; quoted lead time = 7 days; maximum lead time = 14 days. (This is the contract that the lab starts with). price = $1000; quoted lead time = 1 day; maximum lead time = 3 days. price = $1250; quoted lead time = 0.5 days; maximum lead time = 1 day. As before, if a customer orders lead time exceeds the quoted lead time, then the revenue for that order decreases linearly, from the prices above for the quoted lead time to $0 for the maximum lead time. A contract is assigned to a customer order as soon as it arrives at the lab, and that contract cannot be changed subsequently for that order. Contracts for future orders can be selected by clicking on Edit Data on the Customer Order icon. You will also notice a few days where zero jobs are completed by the lab. On such days, the daily average lead time and daily average revenues are meaningless, so a value of zero will appear in the plots and downloaded data on those days.

You are also allowed to buy and sell machines and change the scheduling rule at the tester. Assignment The lab has been running for 50 simulated days, and management has recalled the high- powered operations team (you) to manage the capacity, scheduling, purchasing, and con- tract quotations to maximize the cash generated by the lab over its lifetime. Management is not providing any operating budget beyond the cash generated by the lab itself. You will have control of the lab from day 50 to day 218. At 1 hour per simulated day, this translates to 7 real days. At day 218, you lose control of the lab, and the simulation will quickly run another 50 days of simulation. When you lose control of the lab, management expects you to leave the lab parameters set to maximize the lab cash position when the lab shuts down on day 268. All machines and inventory remaining on day 268 have zero value. After the simulation ends on day 268, you can check the status of your lab, but the lab will no longer be running.

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