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Autos Arrive with
a particular
service demand
Assigned to a
Service Slot
Arrival Process
Service Process
Is Service
Available for Next
Ye s
Receive Service
Not done
Auto Serviced?
(Service time)
Ye s
Exhibit 8.16 Simple process flow model
time horizons, 5:00–7:00 am or 7:00–9:00 am. We distinguish between these two
time horizons because they a have different arrival rate behavior. In general, more
demand arrives in the early period than the later due to traffic congestion issues
becoming more acute later in the morning. Next, the type of service demand that is
requested by an auto must also be determined. It will be restricted to one type of
service per auto, which is another simplifying assumption.
Once we have information on the number of autos that have arrived and the ser-
vice type they have request, the model will direct the auto to one of three queues
(waiting lines) for each type of service—engine/electrical diagnostics, mechani-
cal diagnostics, and oil change. This occurs in the process element Assigned to
Particular Service Slot . At this point, we exit the Arrival Process boundary and
enter the Service Process . The next step, although it might appear to be simple, is
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