Object-oriented programming isn't rocket science, but one can't learn it overnight either. There is a lot of terminology - composed of words like "Encapsulation" and "Polymorphism" and phrases like "Is-a" and "Has-a" - that goes with the territory. The concepts behind these terms are not terribly complicated, but they can be hard to explain. Like most useful fields of study, one must work with it a while before it all clicks together in one's mind. This paper presents the object-oriented concepts that matter most when working with Cocoa, along with quite a bit of hands-on practice using those concepts.
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