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i got a system (a videogame) and an use case (attack) . If the opponent is attacked and he's not online, he receive an email else he doesn't.

I don't know if it's better make one use case:

USR----(ATTACK)<-------<< extends >>---(OFFLINE-ATTACK)----MAIL SERVER

or 

USR----(ATTACK)------MAIL SERVER
skaffman
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vicvic
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1 Answers1

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Each usecase should represent an actor's goal. (OFFLINE-ATTACK) does not sound like an actual valid goal but more like an exception (alternative path).

Martin Spamer
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  • i think the same too, i managed it as a subvariation, the goal is to show the attack button disabled, and show a message "end of the shift". – vicvic May 10 '12 at 11:45