Chesterton's Fence is don't remove something until you understand why it was put there. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0135, within the Reasoning family. The core principle: don't remove something until you understand why it was put there. In incentive terms, it matters because it changes the payoff people perceive before they choose — which means it can be designed for, or exploited.
Scientific Definition
Don't remove something until you understand why it was put there.
Plain-English Definition
Don't remove something until you understand why it was put there.
Feynman Explanation
Every weird policy was probably written after a fire.
Core Principle
Don't remove something until you understand why it was put there.
Mechanisms
Pending editorial review.
Don't remove something until you understand why it was put there.
Pending editorial review.
Pending editorial review.
Pending editorial review.
Pending editorial review.
Reform agendas that under-respect institutional memory.
Inputs (Triggers)
Pending editorial review.
Outputs (Behaviors)
Pending editorial review.
Behavioral Signature
Every weird policy was probably written after a fire.
Examples
- New leadership removes a process and immediately re-creates its original problem.
- Reform agendas that under-respect institutional memory.
Pending editorial review.
Original analysis from The Incentives Lab — how this element behaves inside real payoff structures.
Why this element matters to incentive design
The mistake with this element is treating it as irrationality. It is almost always a rational response to a payoff nobody wrote down. The mechanism underneath it is straightforward: don't remove something until you understand why it was put there. You can recognize it in the field by its signature: every weird policy was probably written after a fire. Every element in the Cognition dimension changes the perceived payoff of an action before the action happens, which is exactly where incentive design has leverage.
How it gets exploited
Left undesigned, reform agendas that under-respect institutional memory. It is amplified whenever reform agendas that under-respect institutional memory. Inside organizations that shows up as reform agendas that under-respect institutional memory. The pattern is the same one Goodhart's Law describes: the measurable proxy attracts the effort, and the purpose behind it quietly loses funding.
How the Lab designs around it
The redesign move is to before removing: write the steelman case for why it exists. The test of any redesign here is simple: after the change, can you name what the organization is now doing less of? If not, the payoff structure did not actually move.
Famous Experiments
Pending editorial review.
Design Principles
- Before removing: write the steelman case for why it exists.
Measurement Approaches
Pending editorial review.
Evidence
Pending editorial review.
Pending editorial review.
The Perverse Incentive Lens™
How this behavior is exploited — and how to redesign around it.
- Before removing: write the steelman case for why it exists.
Pending editorial review.
Pending editorial review.
Interactive Mini Network
Click any neighbor to re-center the graph and follow the threads of connection.
Knowledge Graph Neighbors
Auto-linked to the rest of the Human Behavior Taxonomy by family, domain, dimension, and shared keywords.
Deriving general rules from specific examples; the leap from instance to concept.
The brain evolved to reason adaptively, not always truthfully, to reduce the cost of errors.
We solve problems by adding, even when subtracting would be better.
Assuming that if one option is true, another must be false, when both can be true.
Presuming a purposeful actor behind events that may have no actor at all.
What cannot be settled by experiment is not worth debating.
A finite set of well-defined instructions for solving a problem or performing a computation.
Every model simplifies reality; some are still useful.
Researchers favor conclusions aligned with their school, team, or sponsor.
Using personal stories or isolated examples instead of evidence.
Claiming something is true or better because most people believe it.
Assuming something is true because it is probable or possible.
Where Chesterton's Fence is cited in the corpus
Essays, field guides, and diagnostics from The Incentives Lab that apply this element.
- EssayGoodhart's Law in the Real World
How measurable proxies capture judgment.
- EssayThe Perverse Incentives Hiding in Your KPIs
Cognitive shortcuts turned into scorecards.
- EssayAI Agents Inherit Your Incentives
How this element propagates into automated systems.
- CourseIncentives 101
The free ten-part primer on reading a payoff structure.
- ReferenceThe incentive glossary
Definitions for every mental model, bias, and fallacy in the corpus.
- ReferenceThe Periodic Table of Human Behavior
The full 1,267-element map this page belongs to.
Questions about Chesterton's Fence
- What is Chesterton's Fence?
- Chesterton's Fence is don't remove something until you understand why it was put there. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0135, within the Reasoning family. The core principle: don't remove something until you understand why it was put there. In incentive terms, it matters because it changes the payoff people perceive before they choose — which means it can be designed for, or exploited.
- What is an example of Chesterton's Fence?
- Reform agendas that under-respect institutional memory. The Incentives Lab catalogs everyday, organizational, and historical instances of this element on its Human Behavior Taxonomy™ page (HBT-COG-0135).
- How is Chesterton's Fence exploited?
- Reform agendas that under-respect institutional memory.
- How do you design around Chesterton's Fence?
- Before removing: write the steelman case for why it exists.
- Which behavioral dimension does Chesterton's Fence belong to?
- Chesterton's Fence is classified in the Cognition dimension (COG) of the Human Behavior Taxonomy™, family "Reasoning", class "Mental Model". Its permanent identifier is HBT-COG-0135 and its evidence grade is B.