|Introduction to OOP||Chapter 1: Thinking Object-Oriented :||next||previous||audio||real||text|
But there is more that I know about Fred then just that he is a Florist. I know he is a ShopKeeper, and a Human, and a Mammal, and a Material Objects, and so on.
At each level of abstraction I have certain information recorded. That information is applicable to all lower (more specialized) levels.