Work Product Descriptor: Subsystem Supplementary Requirements
This is essentially the Supplementary Specifications artifact one level down. It has to be a separate artifact because it has a different responsible role (at this level). Otherwise, it has the same purpose and content: it becomes the Supplementary Specifications for the application of RUP to the development of the subsystem.
Based on Method Work Product:  Subsystem Supplementary Requirements
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Optional
Planned