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- The system needs to draw actor's attention to a change in its
internal state.
- The system is about to break a business rule.
- The notification should be asynchronous, that is, actors should
not have to trigger the use case.
Therefore: Write a use case that begins with the system taking the
responsibility to warn the user.
Robert Biddle
Sun May 20 12:22:36 NZST 2001