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|Authors List=Hakob Barseghyan,
|Formulated Year=2015
|Prehistory=Logical positivists were concerned with justifying scientific knowledge and progress. In their case, it was about increasing the probabilities. As a consequence, they believed that a theory of scientific change should be normative. After all, the actual scientific practices may concern many changes in belief that were not justified on epistemic grounds. An illustration of this tendency can be found in [[Alfred Jules Ayer]]'s work engaged with questions of justification such as whether the principle of verifiability is justified rather than empirical questions about the behavior of the scientists.[[CiteRef::Ayer (1952)|p. 6]]
Likewise, [[Karl Popper]] believed that his theories were meant to be normative and he did not focus on studying the actual examples of science.[[CiteRef::Popper (1959)]] However, both group occasionally employed examples from the history of science to persuade other philosophers. For instance, Popper used Eddington’s confirmation of Einstein’s theory to illustrate his concept of crucial experiments.[[CiteRef::Popper (1959)]]

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