I have a situation. In the system that we're designing we're writing white box use cases to more or less document the design of an upcoming system (I know its not recommended but we're doing it).
Being a payment processing system, the user sends a payment which is validated and routed to one of various subsystems for further processing.
The first subsystem that the payment hits has the responsibility of validating and routing the payment to other subsystems (based on rules).
I have two use cases say
1. Validate payment. 2. Route payment based on rules.
Both belong to the validating and routing subsystem which is the SUD for my use case.
I can't seem to hit on a primary actor for these two (nuts and bolts in Cockburn's words) use cases.
The user doesn't care about the validation or routing, so he isn't the primary actor.
The goal seems to be of the subsystem which executes the use cases. But the SUD can't be the primary actor can it.
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