If you look very closely, as I have, at both the Turtle system in particular as well as other trend following systems in general, there are some things that have changed slightly. An examination of ‘rolling’ five or ten year periods will show some smaller deteriorating statistics since the ‘formal’ origination of the trading method back in the early 1980’s. The total returns are slightly lower, the drawdowns are a little deeper, and the recovery periods are a little longer.