MIA: Encyclopedia of Marxism: Glossary of Organisations
Group which formed the centre of Logical Positivism, developed out of study group formed by Moritz Schlick at the Vienna University and included Rudolph Carnap and Kurt Godel. Continued the ideas of Ernst Mach and accepted many ideas of Ludwig Wittgenstein on logical analysis of language. Characterised by the rejection of "metaphysics", i.e. the utilisation of concepts not subject to operational or empirical verification. Later supplanted by Logical Empiricism.