The Duhem-Quine thesis holds that empirical observations never test individual hypotheses in isolation, but always whole systems of theory together with their auxiliary hypotheses. No experiment can unambiguously refute a single hypothesis — a contradiction between theory and observation shows only that at least one assumption in the system is false, but not which one.
This thesis has far-reaching consequences for the question of whether natural science can be the sole or paradigmatic form of cognition.
Duhem’s holism (1906)
Pierre Duhem shows in La Théorie physique: son objet, sa structure (1906) that the physicist “can never subject an isolated hypothesis to the control of experience, but only a whole set of hypotheses.” An experimental contradiction teaches only that at least one hypothesis of the system is unacceptable — which one is revised is decided by bon sens (practical reason), not by observation alone.
Duhem limits this thesis to physical theory. His position is at the same time a defense of the autonomy of natural science: physics is an independent enterprise that neither must nor can answer metaphysical questions.
Quine’s radicalization (1951)
Willard Van Orman Quine radicalizes Duhem’s thesis in Two Dogmas of Empiricism (1951) into a universal holism of all cognition: not only physical theories, but the totality of human knowledge forms a web “that touches experience only at the edges.” With this Quine rejects two pillars of logical positivism:
- The analytic-synthetic distinction: there is no sharp boundary between truths of fact and conceptual truths.
- Reductionism: individual statements cannot be traced back to experience in isolation.
A confrontation with experience does not compel the abandonment of particular sentences, but only a reordering of the entire fabric of knowledge.
Consequences for falsificationism
The Duhem-Quine thesis undermines Karl Popper’s naive falsificationism: the idea of a “crucial experiment” that unambiguously refutes a theory proves to be an idealization. In practice one can always revise auxiliary hypotheses in order to preserve a favored theory.
This does not make science arbitrary, but it shows: the decision as to which hypothesis is given up requires a judgment that goes beyond the purely empirical — a judgment that rests on non-empirical criteria such as simplicity, coherence, and fruitfulness.
Significance for the critique of naturalism
The Duhem-Quine thesis contradicts scientism at a fundamental level:
-
If no theory can be confirmed or refuted by pure empiricism alone, then the scientistic thesis “only empirical knowledge is genuine knowledge” is itself not purely empirically grounded — it presupposes philosophical premises.
-
The bon sens (Duhem) or the criteria of coherence (Quine) are no empirical findings, but expressions of that rationality which distinguishes the person as a spiritual being. Science lives by a power of judgment that withdraws from the scientific method itself.
-
The thesis confirms the architecture of the Personhood ontology: philosophy — as reflection on the presuppositions of science — ontologically precedes natural science.
Plantinga makes use of Duhem’s idea of autonomy: Duhemian Science — empirical research on shared methodological foundations — is possible independently of metaphysical convictions. But the interpretation of the results requires a philosophical framework.
Ontological classification
Superordinate concepts: science
Ontological relations:
- is a subclass of: science
- contradicts: scientism, falsificationism
- supports: philosophy
Chapter assignment: Chapter 2: Method (German)
See also
- Science
- Natural Science
- Falsificationism
- Scientism
- Positivism
- Philosophy
- Rationality
- Cognition
- Pierre Duhem
- Willard Van Orman Quine
- Alvin Plantinga
Sources: Bexten 2017, pp. 44—47, 208 (the concept of science and the question of method).
Further sources:
- Duhem, Pierre (1906): La Théorie physique: son objet, sa structure. Paris: Chevalier et Rivière. — Engl.: The Aim and Structure of Physical Theory, transl. Philip P. Wiener. Princeton: Princeton University Press, 1954.
- Quine, Willard Van Orman (1951): “Two Dogmas of Empiricism”. In: The Philosophical Review 60(1), pp. 20—43.
- Harding, Sandra G. (ed.) (1976): Can Theories Be Refuted? Essays on the Duhem-Quine Thesis. Synthese Library 81. Dordrecht: Reidel.
- Plantinga, Alvin (2011): Where the Conflict Really Lies: Science, Religion, and Naturalism. New York: Oxford University Press.