Page 223 - DCOM303_DMGT504_OPERATION_RESEARCH

Operations Research

Notes
Figure 11.2: Arrangements of Service Facilities (a, b, c)
1. Arrangement of service facilities in series
Customers Served Facility

X X X X Served Customers

(a) Single Queue Single Server

Served Facility

X X X X Served Customers

(b) Single Queue, Multiple Server
2. Arrangement of Service facilities in Parallel
Service Facility

Served Customers
Customers
X X X X
Service Facility
Served Customers

3. Arrangement of Mixed Service facilities

Customers

X X X X
Served
Customer

Service Facilities

11.1.2 Attitude of Customers

Patient Customer: Customer arrives at the service system, stays in the queue until served, no
matter how much he has to wait for service.

Impatient Customer: Customer arrives at the service system, waits for a certain time in the
queue and leaves the system without getting service due to some reasons like long queue before
him.
Balking: Customer decides not to join the queue by seeing the number of customers already in
service system.

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