„The Steady State theory was what Karl Popper would call a good scientific theory: it made definite predictions, which could be tested by observation, and possibly falsified. Unfortunately for the theory, they were falsified.“

—  Stephen Hawking, The Beginning of Time (1996)
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Stephen Hawking23
físico teórico 1942 - 2018

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„Until creationists accept that their claims must be falsifiable and show how they could be falsified, creationism cannot be said to be a scientific theory.“

—  Mordechai Ben-Ari Israeli computer scientist 1948
Just a Theory: Exploring the Nature of Science (2005), Chapter 4, “Falsificationism: If It Might Be Wrong, It’s Science” (p. 75)

„The aim of science is to falsify theories and to replace them by better theories, theories that demonstrate a greater ability to withstand tests.“

—  Alan Chalmers, livro What Is This Thing Called Science?
What Is This Thing Called Science? (Third Edition; 1999), Chapter 6, Sophisticated falsification, novel predictions and the growth of science, p. 83

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„It is a test of true theories not only to account for but to predict phenomena.“

—  William Whewell English philosopher & historian of science 1794 - 1866
Philosophy of the Inductive Sciences (1840), Aphorism 39.

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„Whether you can observe a thing or not depends on the theory which you use. It is the theory which decides what can be observed.“

—  Albert Einstein German-born physicist and founder of the theory of relativity 1879 - 1955
1920s, Objecting to the placing of observables at the heart of the new quantum mechanics, during Heisenberg's 1926 lecture at Berlin; related by Heisenberg, quoted in Unification of Fundamental Forces (1990) by Abdus Salam ISBN 0521371406

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Maurice Allais photo

„A theory is only as good as its assumptions. If the premises are false, the theory has no real scientific value. The only scientific criterion for judging the validity of a scientific theory is a confrontation with the data of experience.“

—  Maurice Allais French economist; 1988 winner of the Nobel Memorial Prize in Economics 1911 - 2010
L'anisotropie de l'espace. La nécessaire révision de certains postulats des théories contemporaines. Les données de l'expérience (1997), p. 591

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„One test of good theory is that it have practical implications.“

—  Charles Perrow American sociologist 1925 - 2019
1970s, Organizational Analysis: A Sociological View, 1970, Context: It is surprising how much discipline is imposed upon theory by requiring that it ‘make a difference’ and provide guidance or useful illumination. I learned long ago from students in professional schools that questions of ‘so what’ or ‘what relevance does this have’ do not signify impatience with theory per se, much less anti-intellectualism, but only impatience with the obvious, general, remote, and vague statements that often parade as social science theory. One test of good theory is that it have practical implications. p. vii

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