3C Clear Clean Concise UML
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communityUML 2torial
5.5 Dynamic model elements
UML 2 has two major dynamic concepts: possibility and change.
Possibility: Possibility is used to indicate that some part of a model represents what is permitted, but not required by that model.
Change: Change is used to indicate that some part of a model represents a difference in the system or its environment from one time to another.
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