In software and systems engineering, a use case is a list of steps, typically defining interactions between a role and a system. From Wikipedia: http://en.wikipedia.org/wiki/Use_case

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How to capture “Display advertisement” use case?

What kind of use case it would be for to "show ad in part of the view"? Who could be the actor to relate with? User or System? As user has no specific goal to see ads, i am wondering what is the best ...