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• Natural Modeling of Problems
  • Partitioning a domain into objects yields a more natural problem decomposition than the functional approach.
• Higher Productivity
  • Well-designed objects are the basis for systems to be assembled largely from reusable modules leading to higher productivity.
• Incremental Development
  • OOP mechanisms such as inheritance and virtual class make it possible to develop systems in an incremental fashion.
• Stable Semantic Modeling
• Clear Interface Description
• Secure Systems
• Better Maintainability

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• Natural Modeling
  • Notion of Objects, Class , Inheritance, Message Passing
  • "The bigger and more complex the project, the greater the gains", by Hayes, Frank, UnixWorld, Aug. 1992.
• Productivity
  • EDS, 14 to 1 Productivity increase over conventional method
  • Steve Jobs, NeXT, CA, 80% less code to write
• Tendency for Change in Various Items [Coad and Yourdon]