Ace
Short answer: the Feynman technique means explaining a topic in plain, simple words as if teaching someone new to it, noticing where your explanation breaks down, going back to your notes to fill those gaps, and then simplifying again. It works because explaining forces you to connect ideas and reveals what you don't really understand. Check your final explanation against your source, so you're simplifying, not getting it wrong.
What is the Feynman technique?
The method is named after the physicist Richard Feynman, who was known for explaining hard ideas in simple language. The idea is straightforward: you only really understand something when you can explain it clearly to someone who doesn't know it yet. Jargon can hide gaps; simple words can't. So you deliberately explain a topic simply, and wherever you get stuck or reach for a technical term you can't unpack, you've found something to study.
Why does explaining something simply help you learn?
When you explain material to yourself, you're forced to connect ideas, fill in steps the textbook skipped, and spot contradictions. Research on self-explanation found that students who explained worked examples to themselves while studying understood them better and solved new problems more successfully than students who didn't (Chi et al., 1989).
Explaining to others helps too. In one study, students who learned material and then explained it on video, as if teaching it, performed better on a later test than students who simply restudied it (Fiorella & Mayer, 2013). Even just expecting to teach can help: students told they would teach a passage organised and recalled it better than those told they would be tested (Nestojko et al., 2014).
The technique also includes retrieval. Explaining from memory, with your notes closed, is a form of retrieval practice, one of the best-supported ways to remember things long term (Roediger & Karpicke, 2006).
How do you use the Feynman technique?
- Pick one concept. Keep it small: "how a nerve impulse travels", "what opportunity cost means", "why the separate condenser mattered". A whole chapter is too big.
- Explain it simply, from memory. Write or say an explanation as if teaching a friend in a different subject. Use short sentences, everyday words and an example or analogy. No notes.
- Find the gaps. Mark every place where you hesitated, waved your hands, or used a term you couldn't explain. Those are your weak spots.
- Go back to the source, then simplify again. Reread just those parts of your notes, then rewrite the explanation more clearly. Repeat until it flows from start to finish.
What are the common mistakes?
- Simplifying until it's wrong. A simple explanation still has to be accurate. When you finish, compare it carefully with your notes or textbook to make sure you haven't dropped something important or changed the meaning.
- Explaining with your notes open. Then you're reading, not recalling. Close everything first.
- Only covering what you already know. It's easy to explain the comfortable parts and skip the rest. Follow the structure of your notes so every part of the topic gets a turn.
- Stopping at the explanation. Understanding a topic and remembering it under exam conditions are different. Follow up with practice questions on the same material.
That last step is where Ace can help: upload the lecture you just explained, and it turns it into questions on the whole thing, each answer showing the line from your notes it came from, so you can check your understanding against the source. You can also pair this method with the blurting method.
Frequently asked questions
Does the Feynman technique work for every subject?
It works best for concepts and processes: science, economics, law, history. For pure memorisation, like vocabulary, combine it with flashcards and spaced repetition.
Do I need someone to explain it to?
No. Writing your explanation down or saying it out loud to an empty room works. Explaining to a real person adds useful questions, so a study partner is a bonus.
How long should a Feynman session take?
Around 15–30 minutes per concept, including going back to your notes and rewriting. Short, focused rounds work better than trying to explain a whole module at once.
Sources
- Chi, M. T. H., Bassok, M., Lewis, M. W., Reimann, P., & Glaser, R. (1989). Self-explanations: How students study and use examples in learning to solve problems. Cognitive Science, 13(2), 145–182.
- Fiorella, L., & Mayer, R. E. (2013). The relative benefits of learning by teaching and teaching expectancy. Contemporary Educational Psychology, 38(4), 281–288.
- Nestojko, J. F., Bui, D. C., Kornell, N., & Bjork, E. L. (2014). Expecting to teach enhances learning and organization of knowledge in free recall of text passages. Memory & Cognition, 42(7), 1038–1048.
- Roediger, H. L., & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255.
