The Logic of Modern Physics is a 1927 philosophy of science book by American physicist and Nobel laureate Percy Williams Bridgman. The book is notable for explicitly identifying, analyzing, and explaining operationalism for the first time, and coining the term operational definition. Widely read by scholars in the social sciences, it had a huge influence in the 1930s and 1940s, and its major influence on the field of psychology in particular surpassed even that on methodology in physics, for which it was originally intended. Source: Wikipedia (en)