Tums has a great practice of insisting that threads maintain their single-mindedness (what outsiders would call delusion) by staying strictly OT without dissent from other ET subcultures. So he creates parallel threads, which is fine by me because IMO SCT exists in a parallel universe with different trading laws from mine. So I will respect that approach in meta-commenting on ScottD's ATS thread. To start with, his thread perfectly exhibits the arrowgunce of the SCT foule. Their desperate need to stand out as original leads them to reject a hundred years of trading analysis, which they disparagingly call the Conventional Wisdom. This means that they are functionally illiterate because they don't READ the trading classics. Specifically in this case the copious literature on system development and testing. I have recited this to them many times, augmented by my own modest experiences, but like all True Believers they are thick-headed. So for my own benefit, to get it off my chest, like hacking up a great gooey green gob of phlegm, here is what they are too stupid to read about. Let us say you have an idea that MACD is predictive. You eyeball likely parameters, code it and test it. Eyeballed parameters are usually pretty good. If they don't work marginally with no optimization, there is nothing there. There is NO WAY that adding anything else as a filter will make it work. Sure you can "optimize" (read curve-fit), but you're just deluding yourself. Profitable strategies are simple, and so obvious and elegant once you discover them that they need little tweaking. To postulate that TWO indicators are necessary to make a system is utter madness. Especially two indicators which individually fail. As is adding tweaking rules ad hoc. Jack's logic diagram is ludicrously complicated, obviously the creation of a demented theoretician who does not trade. But I must admit that it is fun to watch them scurry around blind in Jack's rathole warren maze. I think he must have eventually realized the truth of what I am saying, because as usual he slunk away from the before the inevitable endgame of failure. He offers hope and delivers hokum. But fortunately there is a limitless supply of Candides for him to play Pangloss to for our endless entertainment.