Hi, A few days ago I had a meeting with a fund that wants to trade through my automatic trading system when it will be prepared. I'm in the development stage and have to prove to them (and to myself) a few things before real trading will begin. The thing is, they told me that they already meet with 10 people in the last 2-3 years that tried to develop an automatic trading system and failed. Little question for big answers: What are the main reasons for failing in such a challenge? The methods, backtesting, past against future etc'... Thanx a lot, Ronen.