The most profitable trade in my old journal is also the one I am most embarrassed by. I bought on a rumor out of a group chat, sized the position about three times larger than anything else I was running, had no invalidation level written down anywhere, and got bailed out by a market that decided to rip that week. It roughly tripled. And for the next several months I traded noticeably worse, because some part of my brain had quietly filed that whole sequence under things that work.
Trading is one of the few skill domains where you can do everything wrong and get paid, or do everything right and get punished, on any single attempt. Poker players internalized this a long time ago and learned to separate decision quality from result quality, because a bad call that gets there on the river is still a bad call. Most traders never make that separation. P&L is right there on the screen after every trade, process quality is invisible unless you deliberately go looking for it, and so the sloppy winner gets reinforced while the disciplined loser gets abandoned. Over a few hundred trades that is exactly backwards.
The fix I eventually settled on is boring and it works. Grade every trade from A to F on process alone, before you let yourself think about the money, and keep both numbers side by side long enough for the pattern to become hard to argue with.
What the letter grade actually measures
A trade has five parts you control. Grade each one, then average them into a letter for the whole trade. I score each part zero to four like a GPA, but the exact scale matters much less than using the same one every time.
- Thesis. Could you state, in two sentences before entry, why this trade should work and what specific thing would prove it wrong? An A thesis names a mechanism, a supply event, a positioning imbalance, an insider disclosure the market has not digested yet. An F thesis is "it looks strong" or conviction borrowed from someone else's post.
- Entry. Did you enter at a level your plan defined in advance, or did you chase because watching the move without a position hurt too much? Waiting for your level and missing the trade entirely still scores an A here.
- Sizing. Was the position sized from your risk rules, meaning a fixed fraction of capital at risk between entry and invalidation? Doubling size because you felt sure is an F even when you were right, and especially when you were right.
- Management. While the trade was open, did you do what you said you would do before it opened? Moving a stop further away, adding to a loser without a pre-written plan for adds, and cutting a winner early out of boredom all live here.
- Exit. Did the trade end at your target, your stop, or your time limit? Or did it end because you panicked, got greedy, or wanted the margin free for something shinier?
Notice that none of the five mentions profit. A trade that follows all five and loses money is an A. A trade that violates three of them and triples is a D, and it stays a D forever, no matter how good the screenshot looked.
How to grade without lying to yourself
The rubric is the easy half. The hard half is that the grader is the same person who made the trade, and that person wants a good report card. Three mechanical rules keep the grading mostly honest.
First, the plan has to exist before the entry. A timestamped note, even one ugly sentence with a level, a size, and an invalidation, written before the order goes in. If there is no pre-trade note, the trade caps at a C no matter how well you behaved, because a thesis reconstructed after the fact is a story, and stories always fit.
Second, grade within a day of closing the trade, while you still remember what you actually felt and did. Grading a month of trades in one sitting quietly turns into grading the equity curve.
Third, and this is the rule that does the real work, assign the letter before you look at the P&L number. Cover the column, score the five parts, write the letter down, then reveal the result. The first few weeks of this are genuinely uncomfortable, because you catch yourself reaching for reasons to upgrade winners and downgrade losers in real time. That discomfort is the outcome bias you are trying to train out, and feeling it is more or less the point of the exercise.
The hundred trade experiment
One grade on one trade proves nothing, the same way one result on one trade proves nothing. The payoff comes from volume. Log every trade with two fields, the process grade and the result in R, meaning profit or loss divided by the amount you had at risk at entry. Once you have roughly a hundred trades, bucket them by grade and average the R inside each bucket.
Two things typically show up. At the level of individual trades, grade and outcome barely correlate, which is exactly why outcome bias is so seductive in the first place. Plenty of A trades lose and an alarming number of D trades win. At the bucket level the picture usually flips. The A and B buckets carry a positive average R, the D and F buckets show a wild spread around a mean at or below zero, and the F winners cluster suspiciously often right before the ugliest drawdowns in the log, because a rewarded bad habit gets repeated at growing size until the market collects.
There is a third possibility worth taking seriously. If your A bucket is still negative after a hundred trades, your discipline is fine and the underlying idea is not, and you just found that out for the cost of normal position sizes instead of a blown account. It points you at the thesis machine rather than at your self control. This is roughly the same reason we built backtesting into Blockcircle, to test whether an idea has any edge before you spend months applying discipline to it, because discipline applied to a bad idea just produces consistent losses with excellent paperwork.
A hundred trades sounds like a lot, and for a slower swing trader it might take a year, which is fine. The log compounds either way, and even twenty trades in you will start to notice which letters you hand out most often, which is a diagnosis by itself.
If you want to start tomorrow, the whole setup is one column added to whatever journal you already keep, a one line plan written before each entry, and a rule that the letter goes in before you peek at the result. The money column will keep telling you whether you got lucky. The grade column is the one that tells you whether you are getting better.