Karl R. Popper on scientific methodology

Every scientific theory implies that under certain conditions, certain things will happen. Every test consists in an attempt to realize these conditions, and to find out whether we can obtain a counter-example even if these conditions are realized; for example, by varying other conditions which are not mentioned in the theory. (This shows, by the way, that a ceteris paribus clause, like `all things being equal’, must not be added to a theory since it would destroy its testability.) (p. 288)

Popper, K. R. (1992). Realism and the aim of science. New York: Routledge.


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