Explain It to Your Roommate: The Feynman Technique for Reading
You finish a chapter on opportunity cost. Everything made sense while you read it. Then your roommate asks what you studied, and you say, "It's about the value of the next best alternative forgone," and stop there.
You repeated the textbook's sentence without understanding it. That gap is exactly what the Feynman Technique finds.
The technique has a misleading name
The physicist Richard Feynman is credited with the method, but he never published it as a formal technique. The name came later, from writers who studied how he explained physics in plain language and built a routine around it.
The routine still works regardless of who named it. Researchers have studied the same idea for decades under different labels, including self-explanation and learning by teaching.
Explaining forces you to see your own gaps
In studies of self-explanation, Michelene Chi and colleagues found that students who explained worked examples to themselves learned more than students who just read them. The explaining forced them to notice what they did not understand.
A 2013 study by Logan Fiorella and Richard Mayer tested learning by teaching. Students who studied a passage, then taught it to others without notes, performed better on later tests than students who only reread.
A related 2014 study by Nestojko and colleagues found something simpler. Students who expected to teach the material later remembered more than students who expected a test. The mere plan to explain changed how they studied.
The four steps
Step 1: Pick one concept.Choose something small enough to explain in two minutes. "Opportunity cost" works. "Microeconomics" does not.
Step 2: Explain it in plain words, with no notes.Talk to a roommate, a friend, or your phone's voice recorder. Use everyday language, as if the listener has never taken the course.
Step 3: Mark where you stalled.You will hit moments where you slow down, repeat yourself, or fall back on textbook phrases. Each one points to a gap.
Step 4: Go back to the source and fix the gaps.Reread only the parts you stumbled on. Then explain the concept again, from the top.
A worked example with opportunity cost
First attempt:"Opportunity cost is the value of the next best alternative that you give up when you make a choice."
That sentence is correct and tells the listener nothing. If your roommate asks "so what does that mean?", most students freeze.
After going back to the text and trying again:"Say you have Saturday free. You can attend a paid coding workshop for ₦5,000, or work a shift that pays ₦8,000. If you pick the workshop, you do not only lose the ₦5,000. You also lose the ₦8,000 you would have earned. That ₦8,000 is the opportunity cost."
The second version works because it uses a specific situation with numbers. If you can build an example like that, you understand the concept.
Watch for these warning signs while explaining
You use the textbook's exact words.You memorized a phrase without understanding it.
You say "basically" or "you know" and trail off.You lost the thread and covered it up.
You cannot give an example.The idea is still abstract in your head.
Your listener looks confused.Your explanation skipped a step you did not realize you skipped.
You do not need a roommate
A roommate helps because a real listener asks questions you did not expect. But the technique works with other options.
Voice notes.Record yourself explaining, then play it back. The weak spots are obvious.
A blank page.Write the explanation as if teaching a younger sibling. Use no jargon.
A study partner from your course.Take turns explaining different topics. Each of you catches the other's gaps.
Finding that partner is easier when students on the same campus can connect. Passizy is built for university students, and a study partner from your own course is one of the most useful things a campus network can give you.
When this method fits best
The technique works best for concepts, processes, and arguments: how a vaccine triggers immunity, why inflation reduces buying power, how an algorithm sorts a list.
It fits less well for pure memorization, such as drug names or dates. For those, recall quizzes and spaced review work better. Use each method for what it does best.
What to do tonight
Pick the last concept you read about. Set a timer for two minutes and explain it out loud with your notes closed.
Mark every place you hesitated. Open the book to those parts only. Then explain it again.
Most students find at least one gap on the first try. Finding it tonight is much cheaper than finding it in the exam hall.