After trading/testing various technical studies, indicators, strategies (both manual and automated), I am of the conclusion that the main/core/key factors with respect to Tech/chart based trading are the trend change identification which is possible thru identifying HH,HL,LH,LL and also with the aid of Trendline and Trendline Breaks. May be there could be couple of leading indicators (very few ) which may aid, but it all points out to the very basic stuff. Rest of the things does not matter much. Of course those who use volume would say otherwise.