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interaction diagram?

 
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what is the purpose of a interaction diagram in UML
 
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To depict the interactions of objects for a specific task at hand.
 
(instanceof Sidekick)
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Object Interaction diagrams and Sequence diagrams contain almost exactly the same semantic information. You can convert back and forth between the two diagrams as different views of the same model; Rational Rose can do this automagically.

OIDs are often used earlier in design because they give a nice overview of which objects interact with each other and work well to explore various choices for breaking up responsibility. Sequence diagrams are often considered low-level design artifacts because the time dimension makes them well suited to intricate interactions.

I'll give yet another recommendation for Scott Ambler's AgileModeling.com. It takes some digging but he has a nice set of examples and descriptions of "The Models of UML". Hope that helps!
 
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