Source block generates agents. It is usually used as a starting point of the process flow. In our example, it models customer arrival.
Queue block models queues. In this model it simulates a queue of customers waiting for the moment they can start accessing ATM services.
Delay here simulates the delay associated with the service at ATM.
Sink block indicates the end of the flowchart and discards the incoming agents.
Please refer to Process Modeling Library Reference Guide for the detailed information about all Process Modeling Library blocks.