Refused Bequest.

If a subclass uses only some of the methods and properties inherited from its parents, the hierarchy is off-kilter. The unneeded methods may simply go unused or be redefined and give off exceptions.

Someone was motivated to create inheritance between classes only by the desire to reuse the code in a superclass. But the superclass and subclass are completely different.

• Improves code clarity and organization. You will no longer have to wonder why the Dog class is inherited from the Chair class (even though they both have 4 legs).