Advantages of simulation. New policies, operating procedures, information flows and son on can be explored without disrupting ongoing operation of the real system .
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1) FIFO (First In First Out) also called FCFS (First Come First Serve) - orderly queue.
2) LIFO (Last In First Out) also called LCFS (Last Come First Serve) - stack.
3) SIRO (Serve In Random Order).
4) Priority Queue, that may be viewed as a number of queues for various priorities.