ProfeQuino / The Feynman Technique: How to Explain It Until You Understand It
The Feynman Technique: How to Explain It Until You Understand It
The short answer. The Feynman Technique is a way of studying where you pick a concept, explain it in plain language as if to a curious 12-year-old, notice exactly where you stumble, go back to the source to fix only those gaps, and explain it again. It shows you what you don't understand, which re-reading hides. The technique itself hasn't been tested under that name, but it combines self-explanation and elaborative interrogation (both rated moderate utility by Dunlosky et al., 2013) with learning by teaching. The key detail: it works best when you explain from memory, without notes.
The power is in the stumble. When you can't use jargon, you can't hide behind words you've memorised but don't understand.
What the Feynman Technique is
It's named after the physicist Richard Feynman, famous for explaining hard ideas simply. The version students use has four steps:
- Name the concept as a question ("Why does…?" or "How does…?").
- Explain it from memory in plain words, as if to a curious 12-year-old, using an analogy or everyday example.
- Find the stumbles: every place you hesitated, used a word you couldn't define, or said "basically".
- Repair and re-explain: go to the source only for those gaps, then explain the whole thing again, shorter, without notes.
For example, "osmosis is the movement of water across a partially permeable membrane" sounds right. But why does the water move? Which way? If you can't say, you've found a gap that flashcards would have hidden.
Where it fits in a study system
The Feynman Technique is your understanding tool. Active recall and spaced repetition make things stick; Feynman makes sure what's sticking actually makes sense. Use it for concepts, mechanisms and "explain why" questions, not for lists of facts, which belong on flashcards.
What the evidence says (honestly)
| Ingredient | Evidence |
|---|---|
| Self-explanation | Explaining material to yourself improves understanding (Chi, De Leeuw, Chiu & LaVancher, 1994). Rated moderate utility by Dunlosky et al. (2013) |
| Elaborative interrogation | Asking "why is this true?" Also rated moderate |
| Learning by teaching | Students who expect to teach learn more (Nestojko, Bui, Kornell & Bjork, 2014) |
| The catch | Koh, Lee & Lim (2018) found teaching helped only when students explained without notes, which suggests the benefit comes largely from retrieval |
The Feynman Technique as a package hasn't been tested under that name. And on its own it's less powerful than retrieval plus spacing. So: do it from memory, and then it works as a recall technique and an understanding technique at once.
The full method, with the worksheet. The Study System is my 66-page interactive PDF. It includes the Feynman chapter with a step-by-step protocol and a worked university statistics example, a fillable Feynman Sheet, seven more techniques with the evidence behind each, a two-week plan and a chapter for parents. 29 €, 14-day money-back guarantee. See what's inside The Study System →
The 4-step Feynman protocol
| Step | What you do | Time |
|---|---|---|
| 1 | Name the concept. One concept, written as a question at the top of a page | 1 min |
| 2 | Explain it from memory in plain words. Write or say it aloud. No jargon unless you define it. Use one analogy or everyday example | 5 min |
| 3 | Find the stumbles. Underline every place you hesitated, used a word you couldn't define, or said "basically" | 2 min |
| 4 | Repair and re-explain. Go to the source only for the gaps, explain the whole thing again, shorter, without notes. Finish with a one-sentence version and a mark-scheme version with the correct terms | 5 min |
If you get stuck: explain only the first step, or draw it. If you still can't, read one paragraph of the source, close it, and try again from memory.
Feynman in real subjects
University statistics: what is a p-value?
First explanation, from memory: "It means there's a 3 % chance the null hypothesis is true, so the result is probably real." Stumble: trying to explain it to a 12-year-old, the student can't say what the 3 % is a chance of. That hesitation is underlined as the gap, and the lecture slides are opened for that point only. Repaired explanation: "Imagine the medicine does nothing at all. If that were true, results at least as extreme as ours would turn up only about 3 times in 100 experiments." One line: a p-value is how surprising our data would be if there were really no effect. The first explanation was confident and wrong, a misconception rather than a gap, and only the plain-English test exposed it.
A-level Physics: why does a satellite stay in orbit?
First try: "Gravity balances the centrifugal force." Stumble: you can't explain what "balances" means if the satellite is still accelerating. Back to the source: there's one force, gravity, and it provides the centripetal force; the satellite is constantly falling but moving sideways fast enough to keep missing the Earth.
AP Biology: how does a nerve impulse travel?
Explain it to an imaginary 12-year-old using a "line of dominoes". Then test the analogy: where does it break? Dominoes don't reset; neurons do, during the refractory period. The break point is where the real exam detail lives.
SAT Maths: why does vertex form show the minimum?
If you can explain why (a squared term is never negative, so the smallest it can be is zero), you'll recognise the idea in unfamiliar questions, not only in ones that look like your notes.
GCSE English Literature: Lady Macbeth's sleepwalking scene
Explain it to a friend who hasn't read the play, in under a minute, with one quotation. If you need the book to do it, the quotation isn't in your head yet.
Common mistakes
- Explaining while reading your notes. Close them. Teaching from notes loses most of the benefit (Koh et al., 2018).
- Hiding behind technical words. Every technical term must be followed by "which means…". If you can't finish the sentence, it's a gap.
- Using it for facts that just need memorising. Dates, vocabulary and formulas go on flashcards. Feynman is for "why" and "how".
- Stopping at the simple version. The exam wants the technical version. After the plain explanation, rewrite it with correct terminology, the way a mark scheme would.
- Analogies that are too good to be true. Always ask "where does this analogy break?" The answer is usually examinable.
How the Feynman Technique fits with the rest
Use blurting to find out what you remember and Feynman to find out whether you understand it. Schedule both with spaced repetition. The full ranking of what works is in the best study techniques, and a day-by-day plan is in how to study for exams. Parents can help by being the "12-year-old": ask your child to explain a topic in two minutes (more on the for parents page).
FAQ
What is the Feynman Technique?
It's a study method where you explain a concept in plain language as if teaching a curious 12-year-old, find where your explanation breaks down, go back to the source to fix those gaps, and explain it again.
Is the Feynman Technique proven to work?
Not under that name. It combines self-explanation and elaborative interrogation (both rated moderate utility by Dunlosky et al., 2013) with learning by teaching. It works best when you explain from memory, without notes.
Is the Feynman Technique better than active recall?
They do different jobs. Active recall makes information stick; Feynman checks that you understand it. Explaining from memory is itself a recall exercise, so you get both.
What subjects is the Feynman Technique best for?
Concepts and mechanisms where "why" and "how" matter: sciences, economics, statistics, history causes, literature analysis. For raw facts, use flashcards.
How long should a Feynman session take?
About 10–15 minutes per concept: one minute to name it, five to explain, two to find the stumbles and five to repair and re-explain.
Do I need someone to explain it to?
No. You can write it, say it out loud to an empty chair, or record yourself. If someone is available, even better: a parent or friend who doesn't know the topic is the perfect audience.
What if my explanation falls apart immediately?
That's the technique working. Read one paragraph of the source, close it, and try the first step again. Repeat with one step at a time.
About the author
Quino (ProfeQuino) has taught in Spanish secondary schools since 2016, mainly at Colegio Cristo Crucificado in Mula and before that at Colegio Sagrado Corazón in San Javier, working with students aged 12 to 18. He writes about evidence-based study methods and exam preparation at quino.pro. More about Quino →
Related: Active Recall · Blurting Method · Spaced Repetition · Best Study Techniques · The Study System (PDF)
References: Chi, De Leeuw, Chiu & LaVancher (1994), Cognitive Science 18(3) · Dunlosky et al. (2013), Psychological Science in the Public Interest 14(1) · Koh, Lee & Lim (2018), Applied Cognitive Psychology 32(3) · Nestojko, Bui, Kornell & Bjork (2014), Memory & Cognition 42(7).