Teaching Others

The teaching effect

Evidence

Learning material with the expectation of teaching it, and then actually teaching it, produces better retention and deeper understanding than studying for a test (Nestojko et al., 2014; Fiorella and Mayer, 2013). Two mechanisms are at work. First, explaining requires retrieval — the effortful pulling out of information from long-term memory, which strengthens memory more than re-reading. Second, explaining forces you to structure the material for someone else, which exposes gaps that felt like understanding when you were only reading.

The Feynman technique

Traditional

The physicist Richard Feynman popularized a simple sequence that many students have adopted: 1. Choose the concept you want to learn. 2. Explain it in plain language, as if teaching a beginner. 3. Identify the places where the explanation breaks down. 4. Return to the source to fix those places. 5. Repeat until the explanation is smooth. The technique works because it converts study into performance. It also protects against the most common illusion of learning: the sense of understanding that comes from re-reading familiar material without ever having to produce it.

Explanation vs. performance

KAF Original

Explanation is one form of teaching. Performance is another. Depending on the subject, teaching might mean solving a problem aloud, running a demonstration, coaching a peer, or writing a walk-through. Whichever form fits the subject, the essential ingredient is the same: you must produce something the learner can use, not just recognize the material yourself. Recognition feels like knowing. Production is knowing. The KAfrequency practice is to reach for the production side of the line — explanation, walk-through, demonstration — earlier and more often than students usually do.

The practice: teach a beginner

KAF Original

Choose one topic you have recently studied. Write a one-page explanation for a curious beginner — someone who has none of your background. Use plain language. Include an example. If possible, actually read it to someone. Notice where the writing slows down. Those are your gaps. Return to the source, fix them, and rewrite. The improvement in the second draft is not decoration; it is the visible signature of new understanding.

Learning objectives

The teaching effect

The Feynman technique

Explanation vs. performance

The practice: teach a beginner

Reflect before you answer

Knowledge check