"internal" offers access to all in the module, not just subclasses. "protected" would allow you to modify a member of a class when you inherit from it, whether

"internal" offers access to all in the module, not just subclasses. "protected" would allow you to modify a member of a class when you inherit from it, whether it is in the same module or not. using "internal" or "public" with a comment saying "please only use this when you subclass" the class is not as neat and tidy.