The Feynman technique

Four steps#

1. Pick a concept and write its name at the top of a blank sheet or a new file.
2. Explain it as if to someone with no background — a school student or a friend from a completely different field. In short sentences, with no terms you cannot unpack yourself.
3. Find the places where you got stuck. Wherever the explanation went vague or you had to say "well, it's sort of…", there is a gap. Go back to the textbook for exactly that spot.
4. Simplify and add an example. Rewrite the explanation more briefly and give a real-life example. If no example comes to mind, the understanding is still incomplete.

An example: pressure#

First attempt: "Pressure is force divided by area, measured in pascals." Formally correct, but it is a textbook definition. The question "why is a sharp knife easier to cut with?" leaves you stuck.

Second attempt after going back to the source: "Pressure shows how concentrated a force is in one place. The same force can be spread over a large area — and it will press weakly, like skis on snow. Or it can be gathered on a tiny area — like a knife blade — and the pressure will be huge." Now the explanation works for the knife, for a nail and for a backpack with wide straps.

Why it works#

When we read, the brain recognises familiar words and produces a feeling of understanding. Explaining in your own words requires rebuilding the connections between ideas rather than recognising them. Where there are no connections, the explanation breaks — and you see it at once, without a test or a teacher.

The second effect is memory. Material you rebuilt yourself lasts longer than material retold close to the text.

How to fit it into your studies#

• At the end of every topic — one half-page Feynman explanation.
• Keep the explanations next to your notes: reread them a month later and check that everything is still clear.
• Explain out loud if writing takes too long: recording yourself and listening back also reveals gaps.
• If you have someone, explain it to a real person and ask them to keep asking "why".

When the technique does not fit#

It checks understanding, not skill. You can explain beautifully how to solve quadratic equations and still make calculation mistakes. So explaining does not replace exercises — it comes in a pair with them: first understand, then practise until it is automatic. The practice side is covered in active recall.

Common mistakes#

The main one is explaining "for yourself" and skipping steps that seem obvious. That is exactly where gaps hide. The second is substituting a textbook definition for an explanation: if a term you cannot unpack is still in the text, the step is not done.

Step-by-step plan

1. A conceptOne name at the top of the page.
2. Explain it to a beginnerShort sentences, no unexplained terms.
3. GapsMark where the explanation got vague and go back to the source.
4. Simplify and give an exampleRewrite it shorter; add a real-life example.
5. A month laterReread the explanation and check that the understanding holds.

Sources

• Khan AcademyFree explanations of school topics — useful for checking your own explanation
  free

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