Learning & thinking · a life skill
Simple Mistake Logs
three lines, the same day
Most mistakes get the same treatment: a wince, a "never again", and a week later they're gone, ready to happen again. A mistake log keeps them. Three lines, written the day it happens: what happened, why, and exactly what you'll do next time. Once a month, read the page back. The repeats are hard to miss.
- Easy to start
- Medium impact
- Learn it in 1 week
- Two minutes an entry
No single entry looks like much. Read together, three of the four have the same cause, and one change covers all three.
The next thing that goes wrong
Try it now.
A page at the back of a notebook, or a note on your phone called "Mistakes". Small ones count: a missed bin day is as useful as a missed deadline.
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Write it the same day
Date it, before you've talked yourself out of it. By tomorrow you'll remember a tidier version.
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What happened, plainly
One line of fact, as if someone else did it. No verdict on yourself; "I'm hopeless" isn't something you can fix.
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Why, in a few words
What was going on: rushed, tired, interrupted, didn't check, didn't know. Pick the reason you could do something about.
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Next time, as "When …, I …"
Name the moment and the action. "When I type ‘attached’, I attach it" can be done; "be more careful" can't.
If you can't name the moment, the plan isn't ready yet. -
Read the page back once a month
Circle any reason that turns up twice. That repeat is next month's one change.
Not only for disasters. Near misses count: the email you almost sent to the wrong person, the meeting you nearly forgot. They have the same causes and none of the cost.
Write tonight's entry
Three lines.
Something that went wrong today, or this week. The page checks each line as you write: a verdict on yourself in place of a reason, or a "next time" that's a wish rather than a plan. Add a few, and it looks for the repeats.
This month
0 entriesYour entries land here, numbered down the margin.
Nothing you type is saved or sent anywhere. Copy the page into your own notes before you close this one.
Why "When …, I …"
A plan with a trigger beats a good intention.
The "next time" line borrows a format from psychology. An if–then plan, "when this happens, I'll do that", ties the action to a moment you'll actually meet, so you don't have to remember to remember.
In 2006 Peter Gollwitzer and Paschal Sheeran pooled 94 tests of these plans against simply meaning to do something. The plans helped, by an amount statisticians call medium to large (d = 0.65). Read on a bell curve, that puts the average person with a plan ahead of about three in four people without one.
The honest limit: those studies were about goals like exercising, eating better and booking health checks, not about mistake logs, and they vary a lot in size and quality. We use the format because a repeat mistake has a moment you can name ahead of time, which is exactly what the plans need.
The idea
Why it works.
Memory keeps the feeling of a mistake and loses the details: when it happened, what you were doing, what you'd have needed. Writing three lines the same day keeps the details, which are the only part you can do anything with.
The monthly reread does what no single entry can. One rushed email is bad luck. Three rushed mistakes in a month is a habit, and a habit has one fix that covers them all.
Keep it light
Habits that help.
- Facts, not verdicts. "Missed the train" is useful. "I'm useless with time" isn't.
- Small ones count. Little mistakes come round often, so they show patterns fastest.
- One change a month. Pick the biggest repeat. Five new rules at once won't stick.
- Keep it where you are. A log you have to go and find won't get written.
Practise this in HourLife.
In Journal: Guided templates. One page per day, written a note at a time, with guided templates, photos, tags, search, a cover and writing insights.
