BPMN (Business Process Model and Notation) is a de-facto standard for modeling detailed processes for documentation and automation purposes.
When it comes to process documentation, each good process model should help us answer the questions we have for a process.
Those questions differ from organization to organization, but most commonly what we need to know is:
1) What starts the process
2) What are the results of a process
3) What needs to be done
4) What are the possible variants
5) Who does what
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