Hello Brian, I´m studying computer engineering, and last semester, i studyied AI. The best way for you to understand it, is to read a PROLOG beginers tutorial. Here you have a good one to start with http://www.coli.uni-saarland.de/~kris/learn-prolog-now/html/prolog-notes.pdf[^] if you want to go further, i advise to read this book, it´s a bit old, but very good explaining the concepts, Artificial Intelligence A Modern Approach Stuart J. Russell and Peter Norvig Good luck Nuno -- modified at 19:20 Wednesday 12th April, 2006