List,
have a look at this dissection (a minute and critical analysis) done by Rodney Bates, Wichita State University, in ACM Queue vol. 2, no. 6 - September 2004:
- http://acmqueue.com/modules.php?name=Content&pa=showpage&pid=205
Enjoy!
/Klaus
beginners@lists.squeakfoundation.org