The one primary flaw is the initial assumption that there are working "systems" - the coin tossing thing is absolutely irrelevant, IMO. Traders are the batters, the market is the pitcher. A "system" assumes that you are going to be doing pre-determined entries and exits. the market throws an unlimited number of variables every day, and traders need to be able to respond based on all this stimuli. However, some of the psychology comments are right on. FWIW, Don