Skip to main content
The Incentives Lab
HBT-COG-0464 · Dimension COG · Cognition

McNamara Fallacy

Relying solely on metrics that are easily quantified while ignoring what matters.

Reasoning·Mental Model·Grade B·draft· enriching…

Scientific Definition

Relying solely on metrics that are easily quantified while ignoring what matters.

Plain-English Definition

Relying solely on metrics that are easily quantified while ignoring what matters.

Feynman Explanation

We measured what was easy and forgot to measure what was important.

Core Principle

Relying solely on metrics that are easily quantified while ignoring what matters.

Mechanisms

Psychological

Pending editorial review.

Behavioral Economic

Relying solely on metrics that are easily quantified while ignoring what matters.

Neurological

Pending editorial review.

Evolutionary

Pending editorial review.

Sociological

Pending editorial review.

Computational

Pending editorial review.

Systems

Vanity metrics often replace real outcomes.

Inputs (Triggers)

Pending editorial review.

Outputs (Behaviors)

Pending editorial review.

Behavioral Signature

We measured what was easy and forgot to measure what was important.

Examples

Everyday
  • A war effort measured body count instead of strategic progress.
Modern (Organizational)
  • Vanity metrics often replace real outcomes.
Historical

Pending editorial review.

Famous Experiments

Pending editorial review.

Design Principles

  • Pair every quantifiable metric with a qualitative assessment.

Measurement Approaches

Pending editorial review.

Evidence

Evidence Grade
B (A strongest → E speculative)
Replication
★★★☆☆
Intervention Confidence
3 / 5
Consensus
Pending editorial review (HBT v1.0 auto-seed).
Limitations
Pending editorial review (HBT v1.0 auto-seed).
Open Research Questions

Pending editorial review.

Primary References

Pending editorial review.

Signature Section

The Perverse Incentive Lens™

How this behavior is exploited — and how to redesign around it.

Exploitation
Vanity metrics often replace real outcomes.
Amplifying Incentives
Vanity metrics often replace real outcomes.
Org Failure Modes
Vanity metrics often replace real outcomes.
Societal Failure Modes
Pending editorial review (HBT v1.0 auto-seed).
Ethical Considerations
Pending editorial review (HBT v1.0 auto-seed).
Redesign Strategies
Pair every quantifiable metric with a qualitative assessment.
Diagnostic Questions
  • Pair every quantifiable metric with a qualitative assessment.
Warning Signs

Pending editorial review.

Red Flags

Pending editorial review.

Intervention Playbook
Individual
Pair every quantifiable metric with a qualitative assessment.
Team
Pending editorial review (HBT v1.0 auto-seed).
Organization
Pending editorial review (HBT v1.0 auto-seed).
Policy
Pending editorial review (HBT v1.0 auto-seed).
AI Implications
Detection
Pending editorial review (HBT v1.0 auto-seed).
Measurement
Pending editorial review (HBT v1.0 auto-seed).
Mitigation
Pending editorial review (HBT v1.0 auto-seed).
Responsible Use
Pending editorial review (HBT v1.0 auto-seed).

Interactive Mini Network

Click any neighbor to re-center the graph and follow the threads of connection.

HBT-COG-0464 · COG
McNamara Fallacy
MFAbAbstractionsABAdaptive BiasABAdditive BiasAAAffirming a DisjunctADAgent DetectionARAlder's RazorAlAlgorithmsAMAll Models Are WrongABAllegiance BiasAFAnecdotal Fallacy

Knowledge Graph Neighbors

Version History

v1.1.0 · 2026-06-28Initial auto-seed from corpus.