DrugProduction.xlsx

RiskSerializationData

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FALSE 13440 6497.5 10560 1000
FALSE 13440 6497.5 10560 1500
FALSE 13440 6497.5 10560 2000
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Model

Planning production of a drug
Input section
Ounces required 8000 Distribution of days needed to produce a batch (discrete)
Due date 1-Dec Days Probability
5 0.05
Distribution of yield (ounces) from each batch 6 0.10
7 0.20
Average 900 8 0.30
Standard Deviation 75 9 0.20
10 0.10
11 0.05
Outputs
Batches required
Days to complete
Day to start
Statistical summary measures
Max batches reqd Probability of meeting due date
Start date Probability of completion by due date
Prob of passing inspection 0.8 Avg days reqd 15-Jul
Min days reqd 1-Aug
Max days reqd 15-Aug
Simulation model 5th perc days reqd 1-Sep
Batch Days Yield Pass? CumYield Enough? 95th perc days reqd 15-Sep
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Wozac Company is a drug manufacturer. Wozac has recently accepted an order from its best customer for 8000 ounces of a new miracle drug, and Wozac wants to plan its production schedule to meet the customer’s promised delivery date of December 1. There are three sources of uncertainty that make planning difficult. First, the drug must be produced in batches, and there is uncertainty in the time required to produce a batch, which could be anywhere from 5 to 11 days. This uncertainty is described by the discrete distribution in the model. Second, the yield (usable quantity) from any batch is uncertain. Based on historical data, Wozac believes the yield can be modeled by an average yield of 900 with a standard deviation of 75. Third, all batches must go through a rigorous inspection once they are completed. The probability that a typical batch passes inspection is only 0.8. With probability 0.2, the batch fails inspection, and none of it can be used to help fill the order. Wozac wants to use simulation to help decide how many days prior to the due date it should begin production. To use simulation to determine when Wozac should begin production for this order so that there is a high probability of completing it by the due date.