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Paradigm shift (or revolutionary science) is the term used by Thomas Kuhn in his influential book The Structure of Scientific Revolutions (1962) to describe a change in the basic assumptions, or paradigms, within the ruling theory of science. It is in contrast to his idea of normal science.
According to Kuhn, "A paradigm is what members of a scientific community, and they alone, share." (The Essential Tension, 1977). Unlike a normal scientist, Kuhn held, "a student in the humanities has constantly before him a number of competing and incommensurable solutions to these problems, solutions that he must ultimately examine for himself." (The Structure of Scientific Revolutions). Once a paradigm shift is complete, a scientist cannot, for example, reject the germ theory of disease to posit the possibility that miasma causes disease or reject modern physics and optics to posit that ether carries light. In contrast, a critic in the Humanities can choose to adopt an array of stances (e.g., Marxist criticism, Deconstruction, 19th-century-style literary criticism), which may be more or less fashionable during any given period but which are all regarded as legitimate.
Since the 1960s, the term has also been used in numerous non-scientific contexts to describe a profound change in a fundamental model or perception of events, even though Kuhn himself restricted the use of the term to the hard sciences. Compare as a structured form of Zeitgeist.
A scientific revolution occurs, according to Kuhn, when scientists encounter anomalies which cannot be explained by the universally accepted paradigm within which scientific progress has thereto been made. The paradigm, in Kuhn's view, is not simply the current theory, but the entire worldview in which it exists, and all of the implications which come with it. It is based on features of landscape of knowledge that scientists can identify around them. There are anomalies for all paradigms, Kuhn maintained, that are brushed away as...