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A process with an event-based gateway (click to enlarge)

If you want to model the reactions to different events in a BPMN process, the event-based gateway is very useful. At a normal exclusive splitting gateway, a sequence flow is selected based on data. It is therefore called data-based gateway. For example, a procurement request may be routed to a manager for approval if the total amount exceeds a certain limit. At an event-based gateway, on the other hand, a sequence flow is selected based on the occurence of an event.

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One of the modeling patterns I describe in the new edition of the BPMN book, is „Parallel Checks“. When different persons need to check applications, requests, etc. according to different criteria, these checks can be carried out in parallel. There are two different ways to model this. The simple solution only requires basic BPMN elements, while the more sophisticated solution requires a sub-process and a terminate end event. We start with the simple solution.

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