The Feynman Technique: How to Revise by Explaining Topics in Plain English

You have read the chapter, highlighted half of it and it all felt familiar. Then the exam question arrives and you cannot explain the idea in your own words. That gap between recognising something and truly understanding it is exactly what the Feynman Technique is designed to close. It is simple, it costs nothing, and it works for almost every GCSE and A-Level subject.

What is the Feynman Technique?

The technique is named after the physicist Richard Feynman, who was famous for explaining difficult ideas in plain language. The principle is straightforward: if you cannot explain a topic simply, you do not yet understand it well enough. Instead of rereading notes, you teach the topic out loud (or on paper) as if to a younger student, and use the places where you stumble to show you what to revise next.

It is a form of active recall combined with self-explanation. Both are well supported by research on learning, and both are far more effective than passive rereading or highlighting.

The four steps

Step 1: Pick one small topic

Choose something specific, such as "how enzymes work", "the causes of the First World War" or "how to solve simultaneous equations". Write the topic at the top of a blank page. Keep it small enough to explain in five minutes. Whole units are too big.

Step 2: Explain it without your notes

Close the textbook. Write or say an explanation as if you were teaching a Year 7 pupil who has never heard of the topic. Use short sentences and everyday words. Add an example or a quick diagram where it helps. The moment you reach for jargon you cannot define, or your explanation goes vague, you have found a gap.

Step 3: Find and fix the gaps

Now open your notes, textbook or class materials and check your explanation. Mark anything that was missing, muddled or wrong. Go back to the source, relearn those parts, and rewrite that section of your explanation more clearly. This is where most of the learning happens.

Step 4: Simplify and use analogies

Tidy your explanation until it is short and clear. Where possible, link it to something familiar. For example, you might compare the flow of current in a circuit to water moving through pipes, or compare a cell membrane to a security gate that only lets certain things through. Analogies are not a substitute for the correct terminology, so make sure your final version still uses the key exam words.

A worked example: explaining photosynthesis

Suppose you try to explain photosynthesis and write: "Plants use light to make food." That is a fair start, but notice how much is missing. Where does the light energy go? What are the reactants and products? Why does temperature or light intensity change the rate?

On checking your notes, you realise you forgot the word equation and could not explain limiting factors. You relearn those points, then rewrite: "Plants take in carbon dioxide and water, and use light energy absorbed by chlorophyll to make glucose and oxygen. If there is too little light, carbon dioxide or warmth, the reaction slows down, so one of these becomes the limiting factor." That version is shorter, clearer and exam-ready.

How to use it for different subjects

• Sciences: explain processes step by step, such as respiration, electrolysis or the life cycle of a star, and say why each step happens.
• Maths: teach a method on paper with a worked example, then try a different question using only your explanation.
• English Literature: explain a character's development or a theme in plain language, then add a short quotation to back up each point.
• History and Geography: explain a cause-and-effect chain or a case study as a short "story" with dates, places and outcomes.
• Languages: explain a grammar rule to an imaginary beginner and make up three example sentences.

Making it work in real revision

• Keep sessions short. Ten to fifteen minutes per topic is plenty. Little and often beats one long session.
• Use a real audience. A parent, sibling or friend makes you explain properly. Even a cuddly toy works if nobody is available.
• Record yourself. Listening back shows you where you hesitate or repeat yourself.
• Keep a "gap list". Write down every weak point you uncover, then schedule those topics for spaced repetition over the coming days and weeks.
• Finish with past-paper questions. Check that your understanding holds up under exam conditions and mark answers against the mark scheme.

Common mistakes to avoid

The biggest mistake is explaining with your notes open, which turns an active task into copying. Another is using words you cannot define, which hides gaps instead of exposing them. Finally, do not stop after step two. The value comes from going back to the material, fixing the weak spots and explaining the topic again.

Frequently asked questions

Does the Feynman Technique work for A-Level?

Yes. At A-Level the content is more demanding, so explaining ideas simply is even more valuable. Start with the core concept, then build up to the detail and evaluation that higher-mark questions need.

How long should I spend on each topic?

Aim for about ten to fifteen minutes for a small topic. If it takes much longer, split the topic into smaller parts.

Is it better to write or speak my explanation?

Either works. Speaking is quicker and exposes hesitation, while writing gives you something to review later. Many students do one and then the other.

Can I use it alongside other techniques?

Absolutely. It pairs well with flashcards, past papers and spaced repetition. Use the Feynman Technique to build understanding first, then use the other methods to lock it in and test yourself.

Final thoughts

Understanding beats memorising, and explaining is one of the fastest ways to find out what you really know. Pick one topic today, explain it in plain English without your notes, and see where you get stuck. Those sticking points are exactly where your next revision session should begin.

Want ready-made revision resources to use alongside techniques like this? Explore the study guides and revision materials at RevisionLab and make every revision session count.