A short life of the author
Thomas Samuel Kuhn (18 July 1922 – 17 June 1996) was an American physicist, historian of science, and philosopher whose book The Structure of Scientific Revolutions (1962) is one of the most cited and most influential academic books of the twentieth century — a work that introduced the concept of the “paradigm shift” to the English language, transformed the philosophy and sociology of science, and provoked debates about the nature of scientific knowledge that continue to this day. Kuhn’s central argument — that science does not progress through the steady, cumulative accumulation of facts but through periodic revolutionary upheavals in which one theoretical framework (paradigm) is replaced by another that is fundamentally incompatible with it — challenged the prevailing view of science as a rational, objective, progressive enterprise and opened questions about the social and psychological dimensions of scientific practice that had previously been ignored.
Life
Kuhn was born in Cincinnati, Ohio, and educated at Harvard, where he studied physics and received his Ph.D. in 1949. His intellectual trajectory was changed by a teaching assignment: asked to teach a course on the history of science to humanities students, he discovered that the actual history of science bore little resemblance to the progressive narrative presented in science textbooks. Scientists did not simply discover truths and add them to the stockpile of human knowledge; they worked within theoretical frameworks that shaped what they could see, what questions they could ask, and what counted as evidence.
This insight — that scientific practice is shaped by the theoretical commitments of the scientific community — became the foundation of The Structure of Scientific Revolutions. Kuhn held positions at Harvard, the University of California at Berkeley, Princeton, and MIT.
The Structure of Scientific Revolutions (1962)
The book introduces several concepts that have become central to the vocabulary of intellectual life:
Normal science is the everyday activity of scientists working within an established paradigm — solving puzzles, extending the paradigm’s explanatory range, and refining its predictions. Normal science is not revolutionary; it is the conservative, incremental work that constitutes the vast majority of scientific activity.
Paradigm — the theoretical framework, the set of shared assumptions, methods, and values that defines a scientific community’s approach to its subject. A paradigm determines what problems are worth investigating, what methods are acceptable, and what counts as a satisfactory solution.
Anomaly — an observation or experimental result that cannot be explained within the existing paradigm. Anomalies accumulate over time, creating a sense of crisis.
Scientific revolution — the replacement of one paradigm by another. A revolution occurs when the anomalies become too numerous or too fundamental to be ignored, and a new paradigm emerges that can explain both the successes of the old paradigm and the anomalies that defeated it. Examples include the Copernican revolution, the Newtonian revolution, the Darwinian revolution, and the Einsteinian revolution.
Incommensurability — Kuhn’s most controversial claim: that successive paradigms are not merely different but fundamentally incompatible. Scientists working in different paradigms literally see the world differently — they cannot fully understand or evaluate each other’s work because they operate within different conceptual frameworks. This claim — which seems to imply that scientific progress is not objective but relative — provoked fierce opposition from philosophers of science, particularly Karl Popper and his followers.
Influence and Controversy
The book’s influence has been enormous and has extended far beyond the philosophy of science. The phrase “paradigm shift” has become one of the most widely used (and most widely misused) terms in the English language, applied to everything from corporate strategy to personal development to marketing campaigns.
The serious philosophical debate provoked by the book centres on the question of scientific realism: if paradigm shifts involve genuine conceptual discontinuities, can we say that science makes progress toward truth? Kuhn’s later work attempted to soften the most radical implications of his thesis, but the tension between the idea that science is a social practice and the idea that it discovers objective truths about the natural world remains unresolved.
The Copernican Revolution (1957)
Kuhn’s earlier book is a detailed historical study of the transition from the Ptolemaic to the Copernican model of the solar system — the paradigm shift that served as the prototype for the general theory developed in Structure. The book is a model of intellectual history: rigorous, readable, and attentive to both the scientific and the cultural dimensions of the revolution.
Collecting Kuhn
The Structure of Scientific Revolutions (1962, University of Chicago Press) in first edition brings $200–$800. The book was originally published as a monograph in the International Encyclopedia of Unified Science series, and true first editions are identified by this format. The Copernican Revolution (1957, Harvard University Press) brings $50–$150. Later editions of Structure — particularly the second edition (1970), which includes a significant new postscript — are widely available.