I'm currently trying to understand how to model a system context diagram the right way.
E.g. the System of Interest is a diagnosis system where vehicle data gets preprocessed onboard and some prediction model in the backend tells me if component x is fine or not. Actors would be the vehicle driver/owner and a service employee and some external systems like a mobile app or service management system.
My main problem now is to get the system border right.
- Systems which are part of the actual SoI, like vehicle and backend, should not appear in the context diagram, right?
- If a small functional part of my SoI (like the backend detects defect component x and sends the information including recommendations for actions to the service system to inform the employee) is assigned to an external system (like service management system in this case) - is it still a external system? How do I model relations like that and is there a guideline at which "participation" level my external system becomes an acutal part of my SoI?
