The goal of this strategy is to follow most of the developing trend, protecting at least a portion of the gains that are obtained as the trend progresses. The key strategic variable is therefore related to the choice of the reference percentage, necessary to close the position or to raise the stop-loss level. Theoretically, the choice should be based on the loss a trader is willing to bear or the amount of gain he is willing to give up in order to follow the trend. However, this way the choice would be taken on insignificant values. It is better therefore to choose a percentage that is believed to determine a trend reversal. If this percentage is so high to generate a not sustainable loss, then it means that the chosen operation is not profitable, in relation to the risk propensity of the trader, and it would be therefore not to select.