by Ahmad Hassam Why you need a trading system? You need a trading system to make sure that your trading decisions are not arbitrary and based on your whims or emotions. When selecting a trading system, first try to paper trade it. You need to paper trade your trading system to get the bugs out. Paper trading is not a substitute for live trading but still you can assume that 75% of the results that you achieve in demo trading can be replicated in live trading. Win ratio and the payoff ration