I believe that ExtremeProgramming has to do with taking your PowerBook rock-climbing. Or maybe it should be called EffectiveProgramming instead :) – RobRix

See http://c2.com/cgi/wiki?ExtremeProgramming. The PortlandPatternRepository is where most discussion regarding XP, as it is called, takes place. KentBeck and RonJeffries, while working on ChryslerComprehensiveCompensation(or C3), invented this particular methodology. ExtremeProgramming emphasises:

*UnitTest *ReFactoring *YouArentGonnaNeedIt *OnceAndOnlyOnce *OptimizeLater *ContinuousIntegration *TheSimplestThingThatCouldPossiblyWork