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Thomas Kuhn (1922–1996)

Kuhn showed that scientific communities constitute their own reality — and that the transition between paradigms is not refinement but replacement. Scientists trained in different paradigms inhabit different worlds: different problems, different methods, different meanings for the same words. Incommensurability — the impossibility of full translation between paradigms, developed alongside Feyerabend — showed that different languages carve reality differently without one being reducible to another. SPLectrum reads its own account of language and shared reality in Kuhn’s light.

Thomas Kuhn (1922–1996). Historian and philosopher of science who changed how science understands its own development. Trained as a physicist (PhD from Harvard, 1949), his turn came from teaching a general education course on science for humanities students — reading Aristotle’s physics, he realised it made no sense as bad modern physics but perfect sense as a different way of doing science. That experience became the origin of the paradigm concept. He taught at Berkeley, Princeton, and MIT. Against the picture of steady cumulative progress, Kuhn argued that science alternates between periods of normal science — puzzle-solving within an established framework — and revolutionary episodes that replace one framework with another.

Key concepts

Paradigms. The shared framework — theories, methods, standards, exemplary results — that defines a scientific community at a given time. A paradigm is not just a theory; it is the entire way of seeing, questioning, and practising that makes normal science possible. Scientists trained in different paradigms inhabit different worlds.

Normal science. The everyday work of science: solving puzzles within the paradigm. Normal science does not aim to produce novelty — it aims to articulate and extend what the paradigm already provides. Anomalies are set aside, not celebrated. Most science, most of the time, is normal science.

Crisis and revolution. When anomalies accumulate and resist resolution, the paradigm enters crisis. Confidence erodes, alternatives emerge, and eventually a new paradigm replaces the old. This is not a correction but a transformation — the new paradigm redefines the problems, the methods, and what counts as a solution.

Incommensurability. Scientists working before and after a revolution do not simply disagree — they speak differently. Key terms change meaning across paradigms. “Mass” in Newtonian mechanics is not “mass” in relativity. Full translation between paradigms is impossible, though communication across them is not. Developed independently of and alongside Feyerabend.

Progress without convergence. Does the cycle of revolutions bring science closer to truth? Kuhn deliberately left this open. Each new paradigm solves problems the old one could not, but it also loses things the old paradigm handled well. The cycle produces different ways of practising science, each effective within its own domain — but whether this amounts to progress toward a single reality or just change is the question Kuhn refused to settle. The refusal provoked fierce debate: Popper and Lakatos attacked the apparent irrationality of paradigm shifts; sociologists of science embraced Kuhn further than he was comfortable with. He spent much of his later career distancing himself from the relativist readings.

The 1969 Postscript. In response to criticism that “paradigm” was used in too many senses — one critic counted twenty-one — Kuhn added a postscript to the second edition of Structure. He introduced “disciplinary matrix” as a more precise replacement and distinguished the sociological sense of paradigm (what a community shares) from the exemplar sense (a concrete problem-solution that serves as a model). The concept didn’t stay static.

Where Kuhn stops

Kuhn showed that paradigm shifts transform the world scientists inhabit — but he stayed within science. The broader question — whether all communities, not just scientific ones, constitute their reality through shared language — is not one he asked. His paradigms are disciplinary: physics, chemistry, biology. SPLectrum’s languages are wider: any form of life, any shared activity, any relational medium. And Kuhn deliberately refused to say whether paradigm change is progress toward truth. SPLectrum doesn’t need to answer that question either — but it does ask what the structure of language itself makes possible.

Key works

The Structure of Scientific Revolutions (1962) — paradigms, normal science, crisis, revolution, incommensurability
The Essential Tension (1977) — essays on tradition, innovation, and the balance between convergent and divergent thinking
Black-Body Theory and the Quantum Discontinuity (1978) — a historical case study: Planck and the birth of quantum theory
The Road Since Structure (2000, posthumous) — late essays and interviews; incommensurability refined, relativist readings resisted