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Practical Business Process Modeling and Analysis
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In Chapter 8, we learned about the two most common types of sub-processes: embedded and call activity. In this chapter, while discovering additional types of events, we also learned about two more: event sub-processes and transactions. We also know that sub-processes can be used in two variants: a collapsed variant, which can lead to lower-level models, or an expanded variant (the contents of the sub-process are visible).
Now, it’s time to cover the last type of sub-process, known as the ad hoc sub-process, which is denoted by a tilde (wave).
Figure 9.32 – Ad hoc sub-process
This sub-process allows us to document processes that are less structured and require much more knowledge from their performers. It does not contain the complete set of elements that we usually see in a process—for example, there are no start or end events, and the tasks or sub-processes we put inside do not have to be connected...