Strategies that retain some uncertainty and cannot be easily formalized into mathematical rules are called discretionary. Such strategies can be backtested only manually. They are also prone to emotional errors and various psychological biases. On the bright side, discretionary trading is very flexible and allows experienced traders to avoid losses in difficult market situation, while offering an opportunity to extend profit when traders deem it feasible. Newbie currency traders should probably stay away from discretionary trading, or at least try to minimize the extent of their discretion in trading.
Risk warning: Trading Forex (foreign exchange) or CFDs (contracts for difference) on margin carries a high level of risk and may not be suitable for all investors. There is a possibility that you may sustain a loss equal to or greater than your entire investment. Therefore, you should not invest or risk money that you cannot afford to lose. Before using Admiral Markets UK Ltd, Admiral Markets Cyprus Ltd or Admiral Markets PTY Ltd services, please acknowledge all of the risks associated with trading.
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.