Study guides / Methods
The Feynman Technique: How to Learn by Explaining
The Feynman technique is a way to test your understanding by explaining an idea in plain language, as if to a beginner. Wherever you stall, use jargon or hand-wave, you have found a gap. Go back to the source, fix it and explain again.
What is the Feynman technique?
The technique is named after the physicist Richard Feynman, who was known for explaining hard ideas simply. The four-step routine below is a popular study method that people have built around that reputation. It is not a protocol Feynman published, and there is no study of it by name. It does rest on well-studied ideas: explaining material to yourself and noticing what you do not understand.
The four steps
- Pick one concept. Write its name at the top of a blank page. Choose something small enough to explain in a few paragraphs.
- Explain it in plain language. Write or say it as if to a beginner, with no notes. Avoid terms you cannot define, and use an example.
- Mark where you got stuck. Underline every place you hesitated, used a vague phrase or repeated the textbook wording. Go back to the source and learn those parts.
- Simplify and use an analogy. Rewrite the explanation shorter and clearer. If it needs a diagram or a comparison to make sense, add one.
First attempt: “Natural selection means the strongest survive.”
Where it stalls: “Strongest” does not explain how a population changes. What is passed on, and how?
After going back to the source: “Individuals in a population differ. Some differences are inherited and affect how many offspring an individual leaves. Over generations, the traits linked to more offspring become more common.”
The second version explains variation, inheritance and differences in reproduction, which are the parts an exam question is likely to ask about.
Why explaining shows the gaps
People tend to overrate how well they understand how things work. In a study by Rozenblit and Keil, participants rated their understanding of everyday devices, then tried to write out how they worked, and then re-rated themselves lower. The effect is called the illusion of explanatory depth. Writing out an explanation breaks the illusion because vague understanding does not survive being written down.
There is also research on self-explanation. In a 1994 study by Chi and colleagues, eighth-graders who were prompted to explain a text to themselves line by line learned more than a control group. A broad review of study techniques rated self-explanation as having moderate utility, below practice testing and spaced practice. That is a reason to combine them, not to skip them.
Combine it with recall and spacing
After you have fixed your explanation, close it and try again a day or two later without looking, which turns the technique into recall practice. See active recall for students for other methods, and this plan for spacing your sessions for timing. If you are working from a PDF, use the questions from how to study from a PDF as your topics.
When it works best, and its limits
- Good for: concepts, mechanisms and arguments, such as “why does this happen” topics.
- Weaker for: long lists of facts, dates and vocabulary, where flashcards fit better.
- A risk: you can explain something fluently and still be wrong. Always check your final version against the source, not just against your own sense of clarity.
- Not a replacement for practice: in maths and physics, solve problems as well as explaining them.
Common questions
Do I need someone to explain it to?
No. Writing or speaking it alone works. A friend can help because they will ask questions you did not expect, but the method does not require one.
Can I use AI as the listener?
You can paste your explanation into an AI tool and ask it to find gaps, but check what it says against your source. It can miss errors or suggest wrong corrections, and the point of the method is to find out what you do not know yourself.
How long does one round take?
Usually 15 to 25 minutes for one concept, including the time spent going back to the source.
Feynman technique or blurting?
Use blurting to find out quickly what you remember about a whole topic. Use the Feynman technique on the individual ideas where your blurt showed a gap.