12.2. Reworking the Class Diagram
The process of developing statechart diagrams often reveals the need for additional attributes, associations, and even new classes. It can also reveal errors and inconsistencies in an apparently reasonable class diagram.
We cannot emphasize enough that the process of building Executable UML models is incremental and iterative. Systems are developed incrementally, starting from simple models with limited capabilities; additional capabilities are added incrementally. Within each increment, we iterate over the various models. Writing the statechart diagrams and their state procedures may reveal insufficiencies that can best be corrected by reworking the class diagram.
Do not fall into the trap of trying to build ...
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