Inheritance is one of the primary aspects of OOD. For example, a transportation class can be a base class from which many different modes might be derived, such as a bike, car, or plane.

Consider relevant issues when determining whether to use protected or private members in a base class.

Are there any risks involved with using the protected member access specifier instead of the private member access specifier?

Reflect on examples of where using protected or private members in a base class is necessary.