„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.“

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„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 Australian philosopher of science 1939
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
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
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) <!-- p. 98-101 --> by Abdus Salam

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

—  Charles Perrow American sociologist 1925
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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