South East Training - Business Process Modelling Toolkit

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Gateways and Exception Paths 

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Exception Paths

  • Processes do not always operate as we would hope.  The requisition process, for example, might fail because there is no budget for the products the originator wishes to purchase.  This leads to the need for exception paths to be included in the diagram.

Gateways

  • Exclusive or XOR gateways are used to separate exception paths from the normal path.
  • The sequence takes one path or the other based on a logical condition. For example, is there budget provision - yes or no?
  • This produces two end events. BPMN does not require multiple end events, but it is good practice to separate different end states.
 


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