I am a beginning trader. In investigating "systems" and trying to come up with a method of my own, its clear that the obvious first step is limiting the stocks to be considered. e.g., some might only look at S&P 500 or the Jack Hershey people limit there search to EPS rank and RS rank in the top 80% with limitations on float. So the question is, If one is going to apply some system to a set of good stocks. How can that set of good stocks be determined. As a further constraint, the set should be able to be determined by scanning software of some sort that is available at no or low cost. Just to emphasize, I am talking about determining an initial group of stocks (in my case, to trade long) that would be culled by further rules which are unspecified for purposes of this discussion. All comments appreciated.