What is the Feynman technique?

The Feynman technique is a study method built on one principle: explaining something simply is the test of whether you understand it. It is named after physicist Richard Feynman, who was known for reducing complex ideas to plain explanations.

The four steps:

1. Choose a concept and write its name at the top of a blank page.

2. Explain it as if teaching a beginner. Write it out in full sentences, in plain language, as though to someone with no background — a twelve-year-old is the usual framing. No jargon unless you also define the jargon. Use examples and analogies.

3. Identify where you got stuck. The points where your explanation became vague, where you reached for a technical term as a shortcut, or where you simply could not continue are precisely your gaps. Go back to the source material and fill them.

4. Simplify and refine, then repeat until the explanation flows without borrowed phrasing.

Why it works connects to well-supported findings:

It is retrieval practice. Producing an explanation from memory is active recall, which strengthens retention far more than reviewing notes.

It defeats the fluency illusion. Re-reading produces a strong feeling of understanding that is largely recognition. Explaining exposes the difference immediately — most people are startled by how quickly they stall.

It forces genuine encoding. Translating something into your own words requires understanding the structure rather than the surface. Reciting a textbook definition can be done with none.

The related "protégé effect" — that people learn material better when expecting to teach it — has research support, though effect sizes vary.

Practical notes: write it rather than thinking it, since thinking permits vagueness that writing exposes. Explaining aloud to an actual person works even better. And the stalling point is the output — do not treat it as failure.