9.10. SSDs Within the UP
SSDs are part of the Use-Case Model—a visualization of the interactions implied in the use cases. SSDs were not explicitly mentioned in the original UP description, although the UP creators are aware of and understand the usefulness of such diagrams. SSDs are an example of the many possible skillful analysis and design artifacts or activities that the UP or RUP documents do not mention.
Phases
Inception— SSDs are not usually motivated in inception.
Elaboration— Most SSDs are created during elaboration, when it is useful to identify the details of the system events to clarify what major operations the system must be designed to handle, write system operation contracts (discussed in Chapter 13), and possibly support estimation ...
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