People love to talk about what the intentions are. However, when a system constantly produces a different outcome than the one it is "intended" for then it's perfectly reasonable to assume the actual intention is the outcome it continues to produce.
@escarpment @notroot again, there is no secret purpose. There is the intent and then there's the implementation.
The goal is to understand what results the implementation produces, which is the implicit purpose of the system, and to reconcile that against the intent.
The purpose of the system (actual implementation) is always what the system is doing.
This can often be at odds with the stated intent. Understanding whether that's the case or not is the purpose of POSIWID.