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Traceability to Model Elements

The Trace relationship is a general purpose, widely-used relationship that connects a Requirement to any other modeling element. The relationship is expressed as a dashed line with the keyword <<trace>>, which indicates the meaning; the arrow head points to an up-process element (one that was created earlier in the process).

In this diagram the modeler wants to show that a Requirement has a relationship to a trade study represented by a Document Artifact. The document might have been written in Enterprise Architect or it might be a linked external document.

The Trace relationship acts as a catch-all, and is useful when  a modeler wants to show that a Requirement has a semantic relationship to an up-process element, and none of the other relationships are appropriate.