Processing each list item is a separate instance of the activity, and the MI activity as a whole is complete only when all the item instances are complete.Ī Multi-instance activity is indicated by three parallel bars at bottom center. It means perform the activity once – again, either a task or subprocess – for each item in a list, a process data element that contains multiple items. For that reason, Method and Style asks the modeler to insert a text annotation on any Loop activity, labeled “Loop until ”.Ī Multi-instance (MI) activity is like a For-Each loop in programming. This takes up less space in the diagram than adding the gateway and loopback, but it hides the loop exit condition. A Loop activity is indicated in the diagram by a circular arrow at the bottom center. The semantics of a Loop activity are exactly the same as a non-Loop activity followed by an XOR gateway that either loops back to the activity or continues on. It is possible to set a maximum number of allowed iterations. It’s quite handy for activities that might require multiple tries to complete successfully. Repeat until the exit condition is satisfied. If the condition is true, exit the activity on the normal outgoing sequence flow. If the condition is false, perform the activity again and evaluate the condition once more. It means perform the activity once – it could be either a task or subprocess – and then test the loop exit condition, a Boolean expression of process data. This post will clear things up.Ī Loop activity is like a Do-While loop in programming. In fact, it has multiple ways, and students in my BPMN Method and Style training sometimes get them confused. BPMN has a way to say an activity should be performed more than once.
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