3C Clear Clean Concise UML
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communityUML 2torial
5.3 System structuring elements
UML 2 has three major concepts for structuring the system: time, place, and purpose.
Time: A time is used to represent some interval of time in the system or, if the modeler wishes, some moment in time.
Place: A place is used to represent some region of space in the system, or, if the modeler wishes, some point in space.
Purpose: A purpose is a model element used to express the practical advantage or intended effect of something represented by another model element.
Notice that UML 2 clearly separates these concepts, used for structuring the system that is specified by the model, from the concepts used for structuring the model itself. Model structuring concepts are described in section 6 of this 2torial.
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