This section introduces the notion of specialization. Specialization is the process of proceeding from the general to the specific. This is generally done by adding behavior and attributes to a copy of an existing system while retaining the original. This is what we do when we buy a stock automobile then customize it for our own use. In an information sense we add attributes to the general class. For example; your car comes with a standard muffler.

We can specialize our car by replacing the standard muffler with something more exotic. It is also what big companies do when they have similar products derived from an abstract one.

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