The Feynman Technique

Learn hard ideas by explaining them simply, and find the gaps in what you know.

Here is a quick test. Pick a topic you believe you understand, and try explaining it out loud to an imaginary 12-year-old. No jargon, no reading from your notes. Just say it.

If it comes out smoothly, great. If you find yourself pausing, repeating yourself, or saying “it just sort of does that,” then you have found something useful: the exact spot where your understanding stops. That is the whole idea behind the Feynman Technique.

Why explaining works

When you read, your mind happily skims past things you only half understand. Everything seems to make sense because you are following someone else’s words. When you have to explain something yourself, in your own words, vague understanding gets exposed immediately.

Explaining also makes you recall the idea from memory and rebuild it in your own language, which is a form of active recall. Research on what is called self-explanation has found that students who explain material to themselves tend to understand it more deeply than students who simply reread it.

A small note on the name: this method is named after the physicist Richard Feynman, who was known for explaining hard physics in plain language. The four steps below are a popular way of studying that borrows his spirit. They are not something he wrote down himself.

The four steps

One: pick a concept. Write its name at the top of a blank page. Keep it small enough to explain in a few minutes, like “opportunity cost” or “how a loop works in code,” not a whole chapter.

Two: explain it in plain words. Write or say it as if you were teaching someone younger. Short sentences, everyday language. Do not copy from the textbook. If you need a technical term, explain what it means. Add an example from real life.

Three: mark where you got stuck. Every hesitation, every vague phrase, every “it just does that” is a gap. Circle them. Then go back to your notes or textbook and study only those parts.

Four: simplify and go again. Rewrite the explanation with your new understanding. Cut the jargon, tighten it, find a better example. Then explain it once more, out loud, without looking.

A worked example

Say you are studying inflation. Your first attempt might be: “Inflation is when prices go up.” True, but thin. So you push: why do they go up? You might say, “Because… there is more money?” and then stall. That stall is the gap.

You go back to your notes and find the missing piece. Now you can say: “If there is more money going around, but not more goods to buy, sellers can charge more. So a cedi buys less than it used to.” That is a real explanation. It is also, not by accident, a good start to an exam answer.

Ways to practise it

• Talk to a friend. Take turns explaining topics to each other. A listener who asks “but why?” will push you past surface answers.
• Record a voice note. Listen back for the places you hesitate or ramble. Those are your weak spots.
• Write the one-page version. Fit the whole topic on a single page in simple words. If it will not fit, you have not found the core yet.
• Draw it. A diagram with arrows labelled in plain words often shows missing links that sentences hide.

Common mistakes

• Reciting the textbook. If your explanation sounds like the page, you remember words, not ideas.
• Skipping step three. Spotting a gap helps only if you go back and study it. Many people find the gap and move on.
• Picking topics that are too big. Break chapters into single ideas, and explain them one by one.
• Only explaining what you already know. It feels nice, but it teaches you nothing. Start with the topics that feel shaky.

When to use it, and when not to

This method shines for ideas that need understanding: how something works, why something happens, how one thing leads to another. It is less useful for raw facts, like dates, formulae or vocabulary. For those, flashcards and active recall are quicker. Most subjects need both.

How it looks in different subjects

• Maths and physics. Do not just explain what the steps are. Explain why each step is allowed. “We subtract 3 from both sides” is a step. “Because whatever we do to one side we must do to the other to keep the equation balanced” is an explanation.
• History and social studies. Tell the story of cause and effect in your own words, as if you were telling a friend what happened and why. If you cannot say how one event led to the next, you only have a list of dates.
• Biology and chemistry. Walk through a process from start to finish, such as how a plant makes food, and say what goes in, what comes out and why. The gaps tend to show up at the joins between steps.
• Programming. Read a few lines of code and explain, in plain words, what each line does and what the whole thing is for. Where you say “I think this just works,” you have found something to study.

What a good explanation sounds like

A good explanation uses simple words, gives an example, and could be understood by someone hearing the topic for the first time. It says why, not just what. And it is short. If you are going on for ten minutes about a single idea, it is usually because you are circling, not because it is complicated.

Being a good listener for a friend

If you study with someone, take turns. When it is your turn to listen, do not help too quickly. Let them stumble. Ask “what do you mean by that?” or “why does that happen?” Nine times out of ten the question exposes exactly the gap they needed to see. Only step in with the answer once they have tried and found their own hole.