Throughout the book, a number of trading systems are explored as examples of the art of designing and testing trading systems. This is not a recommendation that you trade these systems. I do not claim that these systems will be profitable in the future, nor that profits or losses will be similar to those shown in the calculations. In fact, there is no guarantee that these calculations are defect free. I urge you to review the section in chapter 3 called a reality check. That section points out the inherent limitations of developing systems with the benefit of hindsight. You should use the examples in this book as an inspiration to develop your own trading systems. Do not forget that there is risk of loss in futures trading.