Cognitive Scaffold

Preparing your thinking workspace

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MENTAL MODEL · M4408

The Duhem-Quine Thesis

The Duhem-Quine Thesis
CultureHigh supportEpistemology
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Updated 2026-08-08

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INTRODUCTION

English translation pending.

CORE DEFINITION

Named after Pierre Duhem and W. V. O. Quine. Scientific hypotheses are never tested alone; they are tested together with auxiliary assumptions about instruments, initial conditions, and background theory. When a prediction fails, logic does not indicate which element of the network is at fault, since any of them could be adjusted instead. Quine extended the point to all knowledge, arguing that the web of belief meets experience as a whole.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Widen the blame: when a prediction fails, list every assumption the test relied on before fixing one - Locate the suspect: ask which auxiliary assumption is least well supported rather than defending the core - Test in pieces: vary one auxiliary assumption at a time to find where the error actually sits

anchor

Anchor fast decisions

A prediction follows from a conjunction of the hypothesis under test and a set of background assumptions, so a false prediction entails only that at least one member of the conjunction is false. Logic cannot identify which. Any element can therefore be preserved by adjusting another, which is why failed predictions rarely force a specific conclusion without additional judgment.

MINIMUM ACTION

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Source support: Explicit

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