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Practical Business Process Modeling and Analysis
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The last element of the BPMN specification that I want to mention in this chapter is the mechanism for marking activities as being performed many times.
Usually, when we think of a process and its steps, what comes to our mind is that once a step is finished, we can move on. Sometimes, however, the situation is a bit more complex. It may be that after completing a step, a check is needed to see whether the desired result has been achieved—if so, we can move on, and if not, the step must be repeated. It is also possible that we can tell in advance that a certain process step will need to be performed several times for us to move on.
For situations like this, BPMN provides special markers that can be applied to both tasks and sub-processes.
Figure 9.37 – Loop, multi-instance, and sequential multi-instance tasks and sub-processes
A loop, whose marker is an arrow in a circle, means that a given step must be performed several...