JR
In your instruction on how to use gateways I saw that by ARIS standards using one event followed by one (XOR) gateway and two activities isn't allowed.
Can somebody please explain me why this isn't allowed? I am new user of ARIS and I am still trying to adopt event driven process chain rules
Hello Johan,
by conventions an activity is a process step, where someone performs something. For example someone may evaluate a condition that may lead to one result or another causing a decision on the process flow to be taken thereafter. Each possible result is represented by a different event, hence for two (or more) possible results each is represented by an event. So you have to use the XOR rule to get from the decision activity to the resulting events. Activities may only have exactly 1 incoming and 1 outgoing process flow connection and so do events. Only at rules you may have 1 incoming and multiple outgoing flows or vice versa.
An event is something that happens. It's like a named state of the process. It cannot perform (that would be activity!) decisions on alternative paths to follow. That's why it cannot be followed by an XOR rule. Some organizations even interpret events as the result itself, though I would not go that far. This would mean in a discrete production process, that the event is the intermediate (or final) product itself. You find that interpretation in automotive industry. I would prefer the object type "product/service" for that purpose as an input/output satellite to activities.
Has this become clearer for you now?
Regards, M. Zschuckelt
