The inception phase chapters and those for iteration-1 in the elaboration phase emphasized a wide range of fundamental analysis and object design skills, in order to share information on a breadth of common steps in building object systems.
In this iteration, the case study just emphasizes:
essential object design
the use of patterns to create a solid design
applying the UML to visualize the models
These are primary objectives of the book, and critical skills.
There is minimal discussion of requirements analysis or domain modeling, and the explanation of the design is more succinct, now that (in iteration-1) a detailed explanation of the basics of how to think in objects has been presented. Many other analysis, design, and implementation activities would of course occur in this iteration, but these are de-emphasized in favor of sharing information about how to do object design.
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