The Feynman Technique: How to Use It When Studying for an Exam
The Feynman technique is a way of finding what you do not know: explain a topic in plain language to someone who knows nothing about it, and notice where you get stuck. It is named after physicist Richard Feynman, and the idea is simple: if you cannot explain it, you have not understood it yet.
The four steps
1. Pick one topic and close the source. Keep it small: “osmosis” works, “biology” does not.
2. Explain it in your own words as if to someone who has never heard of it. If you use a term, say what it means.
3. Mark where you stalled, skipped, or said “you know, that thing”. This is the real value: those are the gaps.
4. Go back to the source only for those gaps, then explain the whole thing again.
The most common mistake
Reciting the source’s sentences from memory. That is repeating, not explaining: it feels familiar but does not test understanding. If you can build the sentence in your own words you understood it; if you cannot, go back.
The second mistake is not noticing when you explain something wrongly. Nobody corrects you when you do this alone, so after explaining, open the source and compare two or three key sentences.
Written or spoken?
Both work, in different ways. When writing it is easy to pause and think, so gaps can hide. When speaking, a stall is audible straight away. If you are preparing for a speaking exam (IELTS Speaking, an interview, a presentation) the spoken version is already the real practice.
Fitting it into exam prep
Treat every top-level syllabus heading as one Feynman round. After explaining a heading, note “fluent”, “stalled” or “could not explain”. Return next day only to the last two. What you can explain shows your progress, not how many hours you sat.
Demostra automates this loop: it has you close the source, explain the topic aloud, and puts each topic in one of three states: proven, blurry, or revisit.
Frequently asked
What is the Feynman technique?
Explaining a topic without notes, in plain words of your own, to find where you stall. The places you stall are the places you do not know, and you study only those.
Does the Feynman technique work for every subject?
It works very well for conceptual subjects such as biology, history, economics and law. It is not enough alone for formula recall or calculation speed; there it is combined with practice problems.
How long does one round take?
Two or three minutes for a small topic. Duration is not the point: seeing where you stall is.