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[[Thomas Kuhn]][[CiteRef::Kuhn (1962)]] saw theories as forming interrelated groups united under the banner of what he called a '''paradigm'''. Paradigms were defined as "coherent traditions of scientific research" [[CiteRef::Kuhn (1962)| p. 10]]. Scientific development alternated between periods of normal science and scientific revolutions. In normal science, a theory or set of interrelated theories contained within a paradigm are used to explain a widening range of phenomena. The accumulation of anomalies which resist explanation can result in a scientific revolution, in which one paradigm is replaced with another. Kuhn argued that paradigms were "incommensurable", and initially described the conversion from one to another in ways that made paradigm choice seem non-rational [[CiteRef::Kuhn (1962)| pp. 111-135]]. He later suggested that paradigm choice was comparative and involved reasoned judgment guided by epistemic values that had remained fixed over history [[CiteRef:: Kuhn (1974)]].