The Understanding vs. Memorization Test
If you cannot explain it five different ways in simple language, you do not actually understand it
The Understanding vs. Memorization Test is Naval Ravikant's method for distinguishing genuine comprehension from superficial knowledge. Drawing on Richard Feynman's principle that knowing the name of something is different from knowing something, Naval argues that most professional knowledge is memorization disguised as understanding. People learn jargon, definitions, and frameworks but cannot explain underlying concepts in simple language from first principles. The test is simple: if you cannot articulate a concept five different ways in every language you know, you do not actually understand it. Genuine understanding means you can re-derive the concept from scratch, explain it to a child, apply it in novel contexts, and identify when it breaks down. In the real world, you get paid for making good judgments based on the basics, not for knowing advanced terminology.
- Knowing the name of something is different from knowing something
- Understanding means being able to re-derive and explain from first principles
- Jargon often substitutes for understanding rather than representing it
- A few deeply understood basics beats many superficially known advanced concepts
- Identify concepts you use regularly but could not explain simplyReview key concepts and terminology you use professionally. For each, attempt to explain it in simple language to an imaginary twelve-year-old without any jargon. If you cannot, you have identified a gap between vocabulary and understanding. Common examples include people using terms like ROI, synergy, or product-market fit without being able to explain the underlying concept from scratch.Pro tipTry explaining your most-used concepts to a friend outside your field. Their confusion reveals exactly where your understanding has gaps.
- Rebuild understanding from first principlesFor each gap, go back to the absolute basics and rebuild understanding from the ground up. Do not read the textbook chapter; instead, derive it yourself from fundamental principles. For accounting, run a lemonade stand in your mind. For investing, start with why a piece of paper has value. The goal is to understand the mechanics underneath the jargon so thoroughly that jargon becomes optional shorthand rather than a necessary crutch.Pro tipNaval's recommendation: keep going back and reading the basics over and over. The tall edifice of knowledge is seductive in academia but useless in the real world without a strong foundation.WarningDo not skip this because it feels too basic. Feynman said nature uses only the longest threads to weave her tapestry.
- Test your understanding by explaining the concept in multiple waysFor each concept rebuilt from first principles, practice explaining it in at least three different ways: a simple analogy, a technical explanation, and a practical example from your experience. If you can do all three fluently, you genuinely understand it. If you get stuck, your understanding remains shallow. Use this as ongoing practice for any new concept you encounter.Pro tipThe best test is teaching someone else. If they understand after your explanation, you understand. If confused, you have more work to do.
Richard Feynman's father would take him for walks and they would see birds. His father would say the name in multiple languages but then explain that knowing the name tells you nothing about the bird itself. The bird likes to stand on one leg, pick lice from its feathers, eat certain foods, fly in certain patterns. Those constitute understanding. The name is just what humans call it. Naval uses this to illustrate that professional jargon works the same way: knowing what something is called tells you about humans, not about the thing itself.
Naval developed this principle through a lifelong commitment to learning that began as an immigrant child using the public library as his primary education. He was deeply influenced by Richard Feynman, whose father taught the difference between knowing a bird's name and understanding its behavior. Naval applied this distinction to business and investing, finding that people who made the best decisions had deep understanding of a few basic principles rather than surface knowledge of many advanced concepts.