However you decide to test your strategy, you need to understand the results you get. Intuitively, you would want to judge the results according to strategy's profitability, but you should not forget about other important parameters of successful trading strategies. They are: low drawdown sizes, short drawdown periods, high probability of winning, high average reward-to-risk ratios and big number of trades. Ideally, your system should earn equally well on bullish and bearish trades, the resulting balance curve should be consistent and uniform, without significant drops or long flat periods.
If the indicator can establish a time when there's an improved chance that a trend has begun, you are tilting the odds in your favour. The indication that a trend might be forming is called a breakout. A breakout is when the price moves beyond the highest high or the lowest low for a specified number of days. For example, a 20-day breakout to the upside is when the price goes above the highest high of the last 20 days.
Arbitrage is based on the premise of the forex trader trying to make a gain from small differences (of the currency) that exist either in the same or different markets. This is primarily a form of speculation. Identifying the right conditions and employing this strategy is not an easy task. Arbitrage strategy best market participants who have best technology systems and have quickest access to information. Arbitrage is best employed when the same currency has two different prices.
Trend-following systems require a particular mindset, because of the long duration—during which time profits can disappear as the market swings—these trades can be more psychologically demanding. When markets are volatile, trends will tend to be more disguised and price swings will be greater. Therefore, a trend-following system is the best trading strategy for Forex markets that are quiet and trending. 
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