Skip to content
Faster Than Normal
General Thinking & Meta-Models

Chimpanzee Test

Model #0724Category: General Thinking & Meta-ModelsDepth to apply:

By Updated 2 sources

4 min read

Contents

  1. 1. Core Idea
  2. 2. How to See It
  3. 3. How to Use It
  4. 4. Founders & Leaders
  5. 5. Connected Models
  6. 6. One Key Quote
  7. 7. Summary & Further Reading
General Thinking & Meta-Models
Section 1

Core Idea

The Chimpanzee Test is a simplicity heuristic: if you can't explain a concept clearly enough that someone with no domain knowledge could grasp it, you probably don't understand it well enough yourself. Named for the extreme version — could you explain it to a chimpanzee? — the real point is that genuine understanding reveals itself in simple explanation, and jargon-heavy complexity often masks shallow thinking. For founders, this is a diagnostic tool: when a strategy, pitch, or product description requires elaborate explanation, the underlying idea may not be clear. Simplicity of explanation signals depth of understanding.

Get Faster Than Normal by email

Ideas from founders and companies.

Free newsletter. Unsubscribe anytime.

Or open the full subscribe page.

Section 2

How to See It

Strategy & Communication
You're seeing it when a strategy deck requires 40 slides to explain the core idea. If the team can't state the strategy in one clear sentence, the strategy itself may be muddled — not just the communication.
Product & Sales
You're seeing it when a sales pitch relies on jargon and features instead of a simple problem-solution statement. If a prospect can't immediately grasp what you do and why it matters, the Chimpanzee Test has failed.
Section 3

How to Use It

Apply the Chimpanzee Test to any explanation that feels too complex. Strip out jargon. State the core idea in one sentence. If you can't, the problem is understanding, not communication. Use it for strategy documents, product pitches, investor decks, and internal alignment. The test isn't about dumbing down — it's about proving you've thought deeply enough to reach simplicity.
Decision filter
"Can we explain this in one sentence to someone outside the domain? If not, do we actually understand it, or are we hiding behind complexity?"
As a founder
Use the Chimpanzee Test on every major communication: pitch, strategy, product positioning. If the team can't explain it simply, revisit the thinking. Simplicity of explanation is a leading indicator of strategic clarity.
Section 5

Founders & Leaders

Charlie MungerVice Chairman, Berkshire Hathaway; investor
Munger famously avoided investments he couldn't explain in plain terms and dismissed complexity as a warning sign rather than a feature. His "too hard" pile was partly a Chimpanzee Test — if an investment thesis required elaborate, domain-specific justification, he treated that as a signal of insufficient understanding or genuine complexity risk. Founders can apply this ruthlessly: if your strategy requires a glossary, simplify it. If your product requires a tutorial to explain the value proposition, rethink the product. The inability to explain simply is a signal, not a communication problem.
Section 7

Connected Models

Reinforces
Feynman Technique
Feynman's method — explain it simply, identify gaps, re-learn — is the structured version of the Chimpanzee Test. Both hold that simplicity of explanation is the best test of understanding.
Tension
Curse of Knowledge
Once you know something, it's hard to imagine not knowing it. The Curse of Knowledge is why the Chimpanzee Test is hard — and why it's valuable. If you can overcome the curse and explain simply, you've truly understood.
Leads-to
[Simplify](/mental-models/simplify)
The Chimpanzee Test is the diagnostic; Simplify is the action. Once you've identified that the explanation is too complex, simplification — stripping to essentials — is the corrective step.
Section 8

One Key Quote

"If you can't explain it simply, you don't understand it well enough."
— [Richard Feynman](/people/richard-feynman), on understanding
Section 11

Summary & Further Reading

The Chimpanzee Test: if you can't explain it simply to a non-expert, you don't understand it well enough. Use it as a diagnostic for strategy, product, and communication. Complexity of explanation signals shallow thinking; simplicity signals depth.
01
Poor Charlie's Almanack — Charlie Munger (2005)
Book
Munger's emphasis on understanding over complexity.
02
Surely You're Joking, Mr. Feynman! — Richard Feynman (1985)
Book
The master of explaining complex ideas simply.

Why this matters next

mental modelsFirst Principles Thinking

Chimpanzee Test applied the First Principles Thinking mental model

mental modelsCurse of Knowledge

Chimpanzee Test applied the Curse of Knowledge mental model

mental modelsFeynman Technique

Chimpanzee Test applied the Feynman Technique mental model

mental modelsChimpanzee Test

Chimpanzee Test applied the Chimpanzee Test mental model

mental modelsPositioning

Chimpanzee Test applied the Positioning mental model

mental modelsSimplify

Chimpanzee Test applied the Simplify mental model

Frequently asked questions

What is Chimpanzee Test?

Chimpanzee Test is a mental model used for better thinking and decision-making.

How do you apply Chimpanzee Test?

To apply Chimpanzee Test, identify situations where this framework is relevant, then use it as a lens to evaluate your options and decisions. The model is most useful when combined with other complementary mental models.

What category does Chimpanzee Test fall under?

Chimpanzee Test falls under the General Thinking & Meta-Models category of mental models. Other models in this category can be found on the General Thinking & Meta-Models hub page.

Why is Chimpanzee Test important?

Chimpanzee Test is important because it provides a structured way to think about problems that would otherwise be approached with intuition alone. Understanding this model helps you avoid common reasoning errors and make better decisions.

Continue exploring

5W

Mental model

5 Whys

A root-cause analysis technique that drills past symptoms by asking why five suc

AW

Mental model

All Models Are Wrong

George Box s insight that every model is a simplification of reality — the quest

AL

Mental model

Amara's Law

We tend to overestimate the effect of a technology in the short run and underest

EM

Mental model

Eisenhower Decision Matrix

A prioritization framework that sorts tasks into four quadrants based on urgency

FT

Mental model

First Principles Thinking

Breaking down complex problems to their most fundamental truths, then reasoning

GL

Mental model

Goodhart's Law

When a measure becomes a target, it ceases to be a good measure — incentives shi

Get Faster Than Normal by email

Ideas from founders and companies.

Free newsletter. Unsubscribe anytime.

Or open the full subscribe page.

Popular Mental Models

First Principles ThinkingOccam's RazorCircle of CompetenceInversionConfirmation BiasSecond-Order ThinkingDunning-Kruger EffectSurvivorship BiasPareto PrincipleOpportunity Cost