Each trade is scored A-F based on how closely the realized exit matched your planned exit (stop/target). Breaking the plan early (cutting winners) costs as much as not honoring stops on losers.

The cost of breaking is the difference between what you would have made following the plan vs what you actually made. A negative number means following the plan would have been worse — your discretion saved you. A positive number means improvising cost you money.

Over enough trades, your discipline grade is the single best predictor of long-term success. Aim for B+ or better.