Hello everyone, I was wondering if someone has some useful general guidelines to evaluate the effectiveness of a trading system. For example: A good trading system should generate consistent benefits both in real time and backtesting. To what extent is it reasonable to go back in time to consider that the backtest is valid? 1 year, 2 years, more? A good system should be profitable over several years, but it should also generate benefits on a considerable volume of operations. I mean that, if you only do two operations a year, is it less reliable than a system that performs 1001 annual operations. What volume of operations would be good? If good systems generate consistent benefits, what would be an acceptable drawdown? No more than 6% or 11% of the total balance of the account? I read that, when more people use the same system, especially if it is automated, its effectiveness decreases. Large operators can anticipate operations or go against the system to make it less effective. Some in forums do not agree with this, which reassures me a little. But let�s suppose that this is true: how many people would be too large operators operating the same system