Gall's Law is a complex system that works is invariably found to have evolved from a simple system. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0340, within the Systems family. The core principle: a complex system that works is invariably found to have evolved from a simple system. 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
A complex system that works is invariably found to have evolved from a simple system.
Plain-English Definition
A complex system that works is invariably found to have evolved from a simple system.
Feynman Explanation
You cannot build complexity from scratch and expect it to work.
Core Principle
A complex system that works is invariably found to have evolved from a simple system.
Mechanisms
Pending editorial review.
A complex system that works is invariably found to have evolved from a simple system.
Pending editorial review.
Pending editorial review.
Pending editorial review.
Pending editorial review.
Big-bang launches of complex systems usually fail.
Inputs (Triggers)
Pending editorial review.
Outputs (Behaviors)
Pending editorial review.
Behavioral Signature
You cannot build complexity from scratch and expect it to work.
Examples
- Successful platforms start simple and add complexity over time.
- Big-bang launches of complex systems usually fail.
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: a complex system that works is invariably found to have evolved from a simple system. You can recognize it in the field by its signature: you cannot build complexity from scratch and expect it to work. 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, big-bang launches of complex systems usually fail. It is amplified whenever big-bang launches of complex systems usually fail. Inside organizations that shows up as big-bang launches of complex systems usually fail. 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 start with a simple, working system and grow it. Watch for it at the boundaries: handoffs, promotions, incident reviews, and budget cycles are where this element gets its power.
Famous Experiments
Pending editorial review.
Design Principles
- Start with a simple, working system and grow it.
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.
- Start with a simple, working system and grow it.
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.
Combining substances to create a new material stronger than its parts.
A single constraint limits the throughput of an entire system.
A system's throughput is constrained by its single slowest step.
Small visible disorders signal that bigger ones will be tolerated.
Adding manpower to a late software project makes it later.
Adding people to a late project makes it later.
A substance that speeds up a reaction without being consumed.
Nonlinear systems are highly sensitive to initial conditions.
Inputs combine under conditions to produce new outputs — sometimes irreversibly.
Software architecture mirrors org structure.
Working together has a cost that scales with the number of people.
The threshold at which a system becomes self-sustaining.
Where Gall's Law 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.
- 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 Gall's Law
- What is Gall's Law?
- Gall's Law is a complex system that works is invariably found to have evolved from a simple system. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0340, within the Systems family. The core principle: a complex system that works is invariably found to have evolved from a simple system. 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 Gall's Law?
- Big-bang launches of complex systems usually fail. The Incentives Lab catalogs everyday, organizational, and historical instances of this element on its Human Behavior Taxonomy™ page (HBT-COG-0340).
- How is Gall's Law exploited?
- Big-bang launches of complex systems usually fail.
- How do you design around Gall's Law?
- Start with a simple, working system and grow it.
- Which behavioral dimension does Gall's Law belong to?
- Gall's Law is classified in the Cognition dimension (COG) of the Human Behavior Taxonomy™, family "Systems", class "Mental Model". Its permanent identifier is HBT-COG-0340 and its evidence grade is B.