Chapter 4 Building an Analysis Business Process Model
A join is the synchronization of several parallel flows. It is a complex flow with two or more source processes and one destination process.
A join should have more than one input flow, and have only one output flow.
The processes associated with each of the paths above the join symbol are parallel. In a join, concurrent flows synchronize. Each flow waits until all input flows reach the join before continuing; the first executed flow waiting for the last one to complete. After the join, only one flow continues below the join.
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