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OO Design, OO Analysis, 4.5 Design Principles, 3 main OO principles,…

- - - - is used to initialize the data members of an object
        when it is created
    - - is used to clean up memory and free system
        resources when an object is no longer in use
    - - retrieves information from the object
    - - resets the value of one or more object attributes
- - - - Class name
      - Responsibility
      - Collaborator
    - - domain users
        
        the experts in the business model
      - OO design analysts
        
        the ones who know OO modeling well and are responsible for filling out the contents of the cards
      - facilitators
        
        is in charge of explaining the session rules and moving the discussion session forward
- - - - Key classes of a system
      - Their relationship