Learning & thinking · a life skill
Simple Teaching Back
close the book, explain it, then check
Reading something twice feels like learning it. Explaining it with the book shut tells you whether you did. Teaching back means saying an idea out loud, to a friend or an empty chair, as if they'd never heard of it, then checking what you said against the source. What you got right is yours. What you missed is tomorrow's two minutes.
- Easy to start
- Medium impact
- Learn it: 1 week
- Two minutes, book shut
The two minutes found what rereading would have hidden: the "why it matters" point never came out. That one gets explained again tomorrow, before anything new.
The habit
Try it now.
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Pick one idea
Something you read or heard today, small enough to explain in two minutes: one concept, one argument, one how-to.
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Close the book
Notes away, tab closed. Explaining with the page in front of you is reading aloud, and it doesn't do the same work.
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Explain it to someone new
Out loud, to a friend, a pet or an empty chair, for two minutes. Use plain words and one example. Where you start to wave your hands is where you're unsure.
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Check against the source
Open the book and go point by point: said, half said, or missed. Don't grade the wording, only whether the idea was there.
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Teach the gap again tomorrow
Only the points you missed or half said, book shut again. When you can say all of them, move on.
Re-explaining the parts you already know feels good and changes nothing.
When to break the rule: for facts you just need to look up, like a phone number or a formula you'll always have to hand, skip it. Teaching back is for ideas you want to understand and use, not for everything you read.
Your teach-back
Hide the points, explain, then check.
Write down the main points of what you just learned, while the source is open. Hide them, and explain the idea in two minutes, out loud or typed. Then show the points again and mark each one. Whatever you missed goes on tomorrow's list.
1The main points, book open
Three to six short points, one per box.
2Explain it, book shut
3Check each point
Your points come back here once you've explained.
How it went
Nothing checked yet.
- Said
- 0
- Half
- 0
- Missed
- 0
Teach again tomorrow
The points you miss or half say will be listed here.
Nothing you type is saved or sent anywhere. Close the tab and it's gone.
The study behind it
Teaching without notes beat teaching from a script, a week later.
Aloysius Koh, Sze Chi Lee and Stephen Lim had students study a text, telling all of them to expect to teach it. Then they split them four ways. Some recorded a video lesson without the text or their notes. Some recorded one by reading a prepared teaching script aloud. Some wrote down everything they could recall, a plain retrieval exercise. The rest did an unrelated task.
A week later, on a test of how well they understood the text, the two groups who had to pull the material out of memory did better: teaching without notes and retrieval practice, which came out about the same. Teaching from the script didn't give that boost. The authors' reading is that teaching helps mostly because it makes you retrieve.
It's one study, and later reviews say the question isn't settled. But it's why this page says close the book: an empty chair works, and so does typing it out, as long as the source is out of sight.
The idea
Why it works.
Pulling an idea out of memory strengthens it more than looking at it again. Explaining it to someone new makes you do that for the whole idea, in order, with the connections, which is harder and more useful than recalling a single fact.
It's also an honest test. Rereading makes everything feel familiar, so you can't tell what you know from what you've just seen. Two minutes with the book shut shows you the difference, and the check tells you exactly what to do next.
When it goes wrong
Habits that help.
- Say it out loud. Thinking it through silently lets you skip the parts you'd stumble on.
- Use one example. If you can't give one, that's the point you've half got.
- Check the next day too. Explaining right after reading is easy; a day later is the real test.
- Keep it short. Two minutes on one idea beats twenty on a whole chapter.
Go deeper
Keep going.
Keep this going in the app.
HourLife turns these ideas into a daily system — goals, habits, focus, and reflection in one private place.
