Just thought I'd share this one here, a few loose ends tied http://www.seanet.com/~ksbrown/kmath123.htm It appears to be a mathematician's explanation and opinion on fuzzy logic. I get the impression that he doesn't trust an FL program to be capable of being fully tested and thus could make decisions which we humans may disagree with, given that we have common sense and a wealth of experience of the world that a micro will never have. Decision-making algorithms are, of course, the responsibility of the programmer. I can see his point, that caveats apply to FL, in his opinion perhaps more than for conventional programming, because their flexibility and adaptability is both an advantage (if you get it right) and a disadvantage (if you get it wrong). He also answered one of my original questions - is fuzzy logic a buzzword ? Jinx