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problem with use case model

use case model is "interaction between an actor and the system?" or "interaction among various objects in the system"
thanks
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emeraldpiggy
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emeraldpiggy
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sunnycoderCommented:
Hello emeraldpiggy,

It depicts system usage by various actors .. Closer to former the difference being there could be multiple actors involved.

"The main purpose of a use case diagram is to show what system functions are performed for which actors. Roles of the actors in the system can be depicted."
http://en.wikipedia.org/wiki/Use_case_diagram

Regards,
sunnycoder
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emeraldpiggyAuthor Commented:
thanks. it makes sense
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