Judging decisions, not results

Two traders finish the day. The first followed the plan to the letter: a setup that qualified, a proper size, a stop in place, a sensible target. The trade lost. The second ignored the plan, tripled the size on a hunch, set no stop, and got lucky when the market jumped the right way, finishing up 40,000 rupees. Judge them by the day's result and the reckless one is the winner. Judge them by the decisions and it is the other way round, because the reckless trader has just been taught that breaking the rules pays, and the market will collect on that lesson soon enough.

A good decision is not a good outcome

Trading is a game of probabilities, not certainties, and that single fact changes how you must judge yourself. In a probabilistic game, the quality of a decision and the quality of its outcome can come apart. A well-reasoned trade with the odds in its favour can still lose, because favourable odds are not a guarantee. A reckless trade with the odds against it can still win, because unfavourable odds still leave room for luck. Confusing the two, treating a win as proof you were right and a loss as proof you were wrong, is such a common error that decision researchers gave it a name: resulting, judging a decision only by how it happened to turn out.

The professional separates the two firmly. A good trade is one that was correct to take given what you knew, sized and managed by the plan, whatever it did afterward. A bad trade is one that broke your rules, even if it happened to make money. You control the decision. You do not control the outcome of any single trade. So the decision is the only fair thing to judge yourself on.

Why one result tells you almost nothing

There is arithmetic behind this, and it is worth seeing. Take the winning system from earlier in the course: a 40% win rate at three-to-one, which earns a healthy plus 0.6R per trade on average. Over a hundred trades it is expected to make about 60R, a fine result. But look at the short run. Because it loses 60% of individual trades, it strings losses together often, and the account bounces around. Run the numbers on the first twenty trades and there is still about a one-in-twenty chance the account is showing a loss, through nothing but variance. Over the first ten trades, that chance is about one in six.

Sit with what that means. A genuinely profitable approach can look like a failure after ten or twenty trades, purely by chance. Judge it by its recent results and abandon it, and you throw away a real edge because of noise. The mirror image is just as dangerous: a losing approach can look brilliant over a short run of luck, tempting you to pour money into it. Single results, and even short strings of them, carry far more luck than signal. Only over many trades does the quality of your process show through.

How to judge yourself instead

If not by the last trade's profit, then how? You grade the process. After a trade, the useful question is not "did I make money" but "did I follow my plan": was this a setup I had defined, did I size it right, was my stop in place, did I honour it, did I let the winner run to the plan. A trade can be a good trade and a loss at the same time, and it should be marked as a good trade. A trade can be a win and a bad trade, a rule broken that happened to pay, and it must be marked as a bad trade, because it is the one that will hurt you when the luck runs out.

This is not a licence to ignore results forever. Over a large enough sample, poor results do mean something is wrong, and you fix the process. But you never let a single outcome, good or bad, rewrite rules you set with care. You judge decisions in the short run and results only in the long run, which is the exact opposite of what instinct wants to do.

What to carry forward

Because trading is a game of odds, the quality of a decision and the quality of its outcome come apart: good trades lose, bad trades win, and short runs are mostly noise, so a real edge can look like failure after twenty trades and a lucky fluke can look like genius. The professional judges the process in the short run and the results only over a large sample, and never lets a single outcome rewrite the rules.

But grading your process requires actually knowing what you did, trade by trade, honestly recorded. That record is the trading journal, the single habit that turns experience into skill, and it is the subject of the next chapter.