I disagree that it's *just* about using objects. The distinction between typical programming that is common in C and FORTRAN, and true OOP, is that you don't think of the program as working step after step, but of objects invoking methods of other objects in a non-deterministic way.

It's very easy to convert a C program that doesn't use objects to one that uses them, but if there is still a strong dependence on how the events of the program should fire, it's not OOP.

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain
It's not what you know, but knowing how to find it if you don't know that's important