Process vs. Outcome — Evaluating Your Trades Correctly

The most common mistake in trading psychology isn't emotional — it's analytical. Traders judge their decisions based on whether they made money, not whether they made good decisions. These are completely different things, and confusing them destroys long-term performance.

The Outcome Bias Problem

You take a trade that meets all your criteria. Your analysis is solid. You manage the position correctly. It hits your stop-loss and you lose $200. Most traders think: "Bad trade — I should have done something different."

You take an impulsive trade with no plan. You hold longer than you should. You get lucky and make $300. Most traders think: "Good trade — I'll do that again."

This is outcome bias — evaluating the quality of a decision based on its result, not its process. In a business with inherent randomness like trading, outcome bias systematically teaches you the wrong lessons: it reinforces lucky bad decisions and penalises disciplined good ones.

The Poker Analogy

Professional poker players understand this intuitively. A player can make the mathematically correct call — let's say calling all-in when they're a 65% favourite — and still lose. That's not a bad decision. It was the best decision available given the information at the time.

If the player folds because "I had a bad feeling," gets lucky that their opponent had the better hand, and congratulates themselves on their instincts — that's outcome bias. Over thousands of hands, the player who makes correct decisions wins even if they occasionally lose "correctly made" hands.

Trading is identical. Over a large enough sample size, good process wins. Outcome bias causes traders to modify good processes after unlucky losses and repeat bad processes after lucky wins. Both changes reduce long-term performance.

What Good Process Evaluation Looks Like

After every trade, ask these three questions — not "did I make money?":

1. Did this trade meet my entry criteria? (Yes/No — not "mostly")
2. Was my position size within my rules? (Yes/No)
3. Did I manage the trade according to my plan? (Yes/No — did I move stops arbitrarily, hold longer than planned, exit early out of fear?)

If all three answers are Yes, it was a good trade regardless of outcome. If any answer is No, it was a bad trade regardless of outcome. Over time, a journal built on these three questions generates actionable data: which entry criteria have the best actual edge, how your rule-following correlates with performance, and exactly where your process breaks down.