The code on this page grew out of a discussion on the Object Technology in Computer Science Education list server. The discussion had been going on for about 36 hours in late March and early April 2000 centered on the question of "What is OO really; is it a real paradigm, different from procedural programming or is it just a packaging mechanism for procedural programming?" Both of the authors believe that it is a real paradigm shift, requiring a change in mental model in the practitioners. Winder produced the first three of the following code fragments to show the difference in styles between hackers, procedural programmers, and (naive) object oriented programmers. Bergin then added the more sophisticated OO version that appears last.