Let's talk about Philosophy of Science

Duhem and Quine: theory underdetermination - Pierre Duhem: In physics, Duhem argued that experiments never test a single hypothesis in isolation but rather a whole web of background assumptions and auxiliary hypotheses. When an experiment conflicts with prediction, you can adjust various parts of that web (instrument calibration, auxiliary assumptions, or the theory itself). Thus empirical data underdetermine which component to revise. (See Duhem, The Aim and Structure of Physical Theory.) - W. V. O. Quine: Quine generalized Duhem’s point into the “Quine-Duhem thesis.” He argued that our scientific beliefs form a holistic network—from logical truths to particular observations—and any statement can be maintained by adjusting other parts of the network. Quine also challenged the analytic–synthetic distinction and emphasized that observation cannot fix theory uniquely; choices among rival theories involve pragmatic and holistic considerations. (See Quine, “Two Dogmas of Empiricism” and “On What There Is.”) Core consequence (shared): Empirical evidence underdetermines theory choice; theories are revisable in multiple ways, so observation alone cannot definitively decide between competing theoretical frameworks. Kuhn: the structure and dynamics of scientific change - Thomas Kuhn offered a different, historically grounded picture in The Structure of Scientific Revolutions. He distinguished “normal science” (puzzle-solving within a dominant paradigm) from “revolutionary science” (paradigm shifts when anomalies accumulate). For Kuhn, paradigms are comprehensive frameworks—methods, exemplars, standards—that shape what counts as a legitimate question and evidence. - Kuhn’s view complements underdetermination: paradigms are incommensurable to varying degrees, so proponents of different paradigms may talk past one another and evaluate evidence by different standards. Theory choice is influenced by pragmatic, aesthetic, and community-based factors (simplicity, scope, fertility), not by deductive logic alone. Contrast and synthesis - Scope and emphasis: Duhem and Quine focus on epistemic holism and the logical problem that data cannot uniquely determine theory. Kuhn focuses on historical, sociological, and normative dimensions—how scientific communities actually operate and shift between frameworks. - Decision factors: Duhem–Quine highlight that background assumptions can be adjusted arbitrarily; Kuhn adds that choices are governed by paradigm-dependent standards and community consensus (so sociological and normative factors shape theory change). - Compatibility: The views are compatible and complementary. Underdetermination describes a logical feature of theory testing; Kuhn supplies a descriptive account of how scientists respond to that feature in practice—often conservatively during normal science and collectively during revolutions. Further reading (short) - Duhem, P., The Aim and Structure of Physical Theory (1914) - Quine, W. V. O., “Two Dogmas of Empiricism” (1951) - Kuhn, T. S., The Structure of Scientific Revolutions (1962) If you’d like, I can give a brief example (e.g., Ptolemy vs. Copernicus, or 19th‑century ether debates) that illustrates these points.