I have to side with traderRX on this. I think most people envision a 'holy grail' as a fixed set of parameters for some TA indicators. Actually it can be anything you define as your own rules.. also it can be flexible and self-monitoring, self-learning. It can be programmed like a good trader, with iron clad discipline. In terms of how many people are successful system traders, nobody knows. The failed ones shout to the world 'There is no holy grail', while the successful ones hide as well as they can and collect dough. One hint.. IB has a number of institution and retail accounts that use there FIX interface for order entry. Those people must be doing automatic trading and some of them must be successful. I have been doing some research on emini futures with some rules I created from scratch, and in back test, it shows some consistency with acceptable drawdown, with over 3 years of tick data. The systems will probably put to live trading in the near future. It is probably a bit tougher to work on a system for stocks, as you have execution issues. But at least a 'trading-assistant' is possible, which can monitor multiple stocks and alert you for set-ups.