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How to show external system in sequence diagram

 
rose deng
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HI,

How to show external system in sequence diagram? I don't find answer in distilled UML book.

Thanks for your answer.
 
Ajith Kallambella
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Using a stereotype such as <<External System>> is one way to do it.
 
Geoffrey Chu
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If it comes from a Use Case, you can add it as an actor (little person)
 
Dean Fredericks
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I agree with the previous post. Add it as an Actor. And actor doesnt need to be a person, its anything outside the interacts with the systems. Just like this external system is interacting with ur system. An actor can even be time.
 
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