Lessons › Trading psychology and process › Good decision, bad outcome
World 9 · Trading psychology and process · lesson 9 · level 3
Good decision, bad outcome
A good trade can lose and a bad trade can win, so grade how you decided, not just what happened.
In one line
You broke every rule and still won. Was that a good trade?
Explained simply
Crossing the road without looking and arriving safely doesn't make it a good idea. Trading is the same: luck can make a bad decision win or a good decision lose. So you grade the decision, not just the result.
The lesson
Because chance plays a part in markets, a well-planned trade that follows every rule can still lose, and a reckless trade can win. If you judge only by outcomes, you may learn the wrong lessons, such as 'skipping stops works'. Grading each trade on process, meaning a valid setup, correct size and following the plan, builds skill over many trades. Variance, the natural spread of results around the average, means even a solid method has stretches that look bad.
A worked example
Illustrative example: a method wins 40% of its trades at 2R and loses 60% at 1R, so it averages 0.4 x 2 - 0.6 x 1 = 0.2R per trade. Even so, the chance that the next 3 trades all lose is 0.6 x 0.6 x 0.6 = 0.216, about 22%, or roughly 1 time in 5. Three good-process losses in a row are normal for this method, not proof it is broken. Meanwhile, a trader who skips stops can win small for weeks and then lose 8R in a single gap.
The same idea at four levels
- Beginner. A good decision can lose and a bad decision can win, because luck plays a part.
- Foundation. Grade each trade on process: valid setup, correct size and plan followed.
- Intermediate. Use the 2x2 grid: good or bad process against good or bad outcome.
- Advanced. The most dangerous box is bad process with a good outcome, because it rewards a habit that will eventually cause a big loss.
- Expert. Over many trades, results drift toward your method's true average, so your process score is the part you control and the part that lets a real edge show up.
Mistakes to avoid
- Deciding a rule is bad after one losing trade that followed it.
- Keeping a bad habit because it happened to win once.
- Scoring your day only by money made or lost.
Check yourself
Can a trade that followed every rule still lose?
Yes, luck plays a part. Good process improves the odds; it does not remove luck.
What should you grade each trade on?
Process: setup, size and plan followed. Process is what you control.
You skipped your stop and still won. Which box is that?
Bad process, good outcome. The result was good, the decision was not.
Which box is the most dangerous to learn from?
Bad process, good outcome. It teaches you that bad habits pay.
A method wins 40% at 2R and loses 60% at 1R. What is its average per trade?
+0.2R. 0.8R minus 0.6R is +0.2R.
Goal of this lesson: Judge trades by the quality of the decision, not only by the result.