Process: Iterative and Evolutionary Object Design - UML

The essential point: Keep it light and short, move quickly to code and test, and don't try to detail everything in UML models. Model the creative, difficult parts of the design.

Figure 18.28 offers suggestions on the time and space for doing this work.

Figure 18.28 Sample process and setting context

Object Design Within the UP

To again consider the UP as the example iterative method: use case realizations are part of the UP Design Model.

Inception— The Design Model and use case realizations will not usually be started until elaboration because they involve detailed design decisions, which are premature during inception.

Elaboration— During this phase, use case realizations may be created for the most architecturally significant or risky scenarios of the design. However, UML diagramming will not be done for every scenario, and not necessarily in complete and fine-grained detail. The idea is to do interaction diagrams for the key use case realizations that benefit from some forethought and exploration of alternatives, focusing on the major design decisions.

Construction— Use case realizations are created for remaining design problems.

Table 18.1 summarizes

Table 18.1 Sample UP artifacts and timing, s - start; r - refine


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