The common answer is if it makes any money.  While this is obviously true, it does get a little more complicated than that.  You want a forex trading system to take care of all the variables. It doesn’t matter if you are scalping the market or playing with a longer term in mind, the system should work irregardless of the market conditions.  There aren’t many forex trading systems that meet this kind of high standard. One forex trading system that I can say that did help me was Trading in The Buff.  It was one of the few trading systems that actually did what was on the sales page.