How to Use BPMN Gateways?
Published on 16 February 17
Lynia0
Gateways are used to control the flow of the process and define ramifications in a BPMN diagram. Learn what they mean and how to use them.
Gateways in a BPMN diagram are used to control how the process flows. In BPMN (Business Process Model and Notation) diagram, only sequence flow will affect the flow of the process, and message flow should not affect the flow of the process. This article will show different type of gateways and how to use them in a BPMN diagram. 
An exclusive gateway evaluates the business process and leads the flow into one of the two or more mutually exclusive paths and directs the flow exactly to one of the output branches. In the example above, an exclusive gateway requires to evaluate whether to hire the candidate or not. In this case, the candidate will get hired if satisfies the requirement, and will be rejected if not satisfied.
An event-based gateway is similar to a exclusive gateway because both involve one path in the flow but the trigger of the gateway is base on event occur instead of evaluate condition. In the case of using an event-based gateway, you need to evaluate which event has occurred.
Parallel gateways are used to represent two tasks in a business flow. A parallel gateway is used to visualize concurrent execution of activities. We the process arrive to parallel gateway node, the work will split into multiple token and will merge when reach to the joining parallel gateway. Above in typical example of parallel gateway.
A Parallel Event-Based gateway is similar to a parallel gateway. It allows for more than one process to happen at the same time. The difference from a parallel gateway is that the processes are dependent from one another. At parallel event-based gateway, multiple events can trigger multiple processes, but the processes are still dependent from one another.
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