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pre-conditions of use cases

Ronald Wouters
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in the assignment I am working on, there is always first a "brief description" followed by the "basic flow". Can you consider this brief description as a pre-condition (in uml terminology) for executing the use case ? Say the "pre-condition" mentions authorized users, but no explicit login use case is given, can you make any kind of assumption then regarding authentication and or authorization, like out of scope ?
I hope this isn't going into too much detail...

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