Introduction to OOP Chapter 1: Thinking Object-Oriented : next previous audio real text

Hierarchies of Categories

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.

Intro OOP, Chapter 1, Slide 26