Identifying Object Classes

• Class definition must be pertinent to the domain
• Implied vs. Explicit Knowledge
• Classes often correspond to Nouns
• If attributes, operations, or roles have attributes of their own, they should be modeled as classes.
• Choose meaningful names

Refinement by Eliminating Unnecessary Classes

• Eliminate Redundancy
• Keep the Class with the Most Meaningful Name
• Eliminate Irrelevant for Problem Domain
• Eliminate Not Needed for Solution of Problem
• Eliminate Fuzzy Classes
  • Can be described by more specific class name
• Eliminate Class if it has One Attribute, it is Probably an Attribute of Some Other Class
• Don't Focus on Operations (Behaviors)
  • These Can Be Determined More Easily in Later Stages

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