The actual structure of our survey example ICA has queuing model 2 (fig.2). A queuing model with single
queue and multiple parallel servers (fig.1) does not clearly evaluate performance for each server. For
instance, the utilization factor for both servers varies in each analysis, i.e. for model 1 its 89% whereas for
model 2 its 99%. A simulation process shows the performance of each server with their corresponding
queues (fig.2). For instance, in server 2 each customer has to wait for 15.67 minutes in case of 40
customers in a queue and in server 1 each customer has to wait for 21.87 minutes in case of 31 customers
waiting in a queue for being served.