Forex is an international trading business so every body must be perfect in this business. I think that if any one is not perfect in here he can not success in the trading. I also think that if a man can be turn into EA(Expert Adviser ) he must be efficient in the business , because i think that when he advise something to the other person he must be analysis about it ,so he must be efficient about this .So it is true that EA(Expert Adviser ) is perfect in the trading system.