By Doug Rosenberg

Positioned among the very huge Rational Unified approach and the very small severe programing process, the ICONIX strategy uses the Unified Modeling Language. The authors assessment this method which attracts on these types of methodologies, and produce fact to concept through a operating web book shop instance and routines. Appendices comprise a part of a version record (available in complete from an auxiliary net site), and use case documentation. A aiding workbook and CD-ROM also are to be had. either authors are with ICONIX software program Engineering, Inc.

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Figure 5-3 shows where robustness analysis resides within the “big picture” for the ICONIX process. Figure 5-3. Robustness Analysis Helps You Refine the Use Case Text and the Domain Model The Key Elements of Robustness Analysis Robustness analysis plays several essential roles within the ICONIX process. Note that you will refine both your use case text and your static model as a result of robustness analysis, as shown in Figure 5-4. Figure 5-4. Robustness Model–Static Model Feedback Loop ?? It provides a sanity check by helping you make sure that your use case text is correct and that you haven’t specified system behavior that’s unreasonable— or impossible—given the set of objects you have to work with.

These rules are in place primarily to get your text into noun-verb-noun format and to help ensure that you don’t start allocating behavior to objects before you have enough information to make good design decisions. ) The rules about boundary objects are in place to ensure that you explicitly specify the boundaries of the system, outside of which reside the actor(s) involved in your use cases. Don’t use robustness analysis to help you use a consistent format for your use case text. The boundary object–controller–entity object pattern will tend to appear on many of your robustness diagrams.

And there are times when you need longer use cases. But you should use techniques such as the invokes and precedes constructs we talk about in Use Case Driven Object Modeling with UML to factor out common behavior so that you can write concise use cases that you’re more likely to be able to reuse—and you should definitely stay away from lengthy use case templates that generate considerably more heat than light. Chapter 5. Robustness Analysis There are two major questions that help us link the dynamic model with the static model.

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