incomingOO.tex

Systematizing to show relationships, 
analogies that exemplify the shared relationship,
offer the opportunity to perform generalization, abstraction.

Mathematization, symbolization, makes the relationships clear, facilitating generalization.

Abstraction, specialization and generalization are key ideas for object-orientation.

It makes sense to see what students already know (even when it is not so) about symbolization and relationships, going into the course on object orientation.

Even when the single relationship is "is a kind of", and the principle, Liskov's Substitutability Principle, is provided, students sometimes experience difficulty creating and using inheritance hierarchies.