this is a simple explanation.An ineffective trading plan shows much greater losses than anticipated in historical testing. Markets may have changed, volatility within a certain trading instrument may have lessened, or the trading plan simply is not performing as well as expected. One will benefit by remaining unemotional and businesslike. It might be time to reevaluate the trading plan and make a few changes, or to start over with a new trading plan. An unsuccessful trading plan is a problem that needs to be solved. It is not necessarily the end of the trading business.