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You ve been hired as a consultant for a local electronics repair shop called TechFix . They specialize in repairing smartphones and laptops. TechFix has

Youve been hired as a consultant for a local electronics repair shop called TechFix. They
specialize in repairing smartphones and laptops. TechFix has a 2 step process. When a repair
arrives, they first go through a diagnostic process where a diagnostic technician evaluates the
needed repairs and estimates the cost of the repairs. The second step is to go to the
appropriate repair station. They have a repair station for Smartphones that is staffed by a
Smartphone Repair Technician and they have a repair station for Laptops that is staffed by a
Laptop Repair Technician.
The shop is open 7 days a week from 9:00 AM 7:00 PM. On average 1 repair order arrives per
hour during this time. During this 10 hour period, the shop is staffed by 1 Diagnostic Technician,
1 Laptop Repair Technician, and 1 Smartphone Repair Technician. At the end of the day, if a
technician is working on a repair, the work will be preempted and started again the next day.
(Hint: use the preempt Schedule Rule in your model.)
Of the repairs that come in, roughly half of them are for Smartphones and the other half are for
Laptops. Of the smartphone repairs, 60% are minor and 40% are major repairs. Of the laptop
repairs, 30% are minor and 70% are major repairs. The service times are at each step in the
process are listed below.
Smartphone Laptop
Diagnosis Uniform 15 to 30 minutes Uniform 30 to 45 minutes
Minor Repair Normal with mean of 1 hour
and standard deviation of .2
hours
Normal with mean of 1.5
hours and standard deviation
of .2 hours
Major Repair Normal with mean of 3 hours
and standard deviation of .5
hours
Normal with mean of 4 hours
and standard deviation of .5
hours
Run the model for 30 days and 100 replications. Use a base time unit of hours. Keep track of the
time that a smartphone and laptop are in the system (including the overnight hours.) For
example, if a smartphone comes in at 10:00 AM on Monday and is finished at 11:00 AM on
Tuesday, it would have been in the system for 25 hours.
Round all answers to 2 decimal places.
a. Fill in the following table:
Measure Average
Smartphones Time in System
Laptops Time in System
Diagnostic Tech Scheduled
Utilization
Smartphone Repair Tech
Scheduled Utilization
Laptop Repair Tech Scheduled
Utilization
b. If you could add 1 more resource to the system, what resource would you add and why

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