Karl Popper the Open Society

Karl Popper’s The Logic of Scientific Discovery offers a radical account of scientific knowledge: rather than verifying theories by accumulating positive observations, science progresses by proposing bold conjectures and subjecting them to severe tests that try to falsify them. A good scientific theory is one that is highly falsifiable — it makes risky predictions that could, in principle, be shown false. When a theory survives repeated attempts at refutation, it is corroborated (supported), but never finally verified or proven true. Knowledge thus advances through conjectures and refutations; certainty is unattainable, and fallibility is essential. Key points - Falsifiability as demarcation: A statement is scientific if it can be empirically refuted; non-falsifiable claims (metaphysics, pseudoscience) are outside empirical science. - Asymmetry of verification and falsification: No number of positive instances can conclusively verify a universal law, but a single counterinstance can refute it. - Corroboration not justification: Surviving tests increases a theory’s corroboration, not its truth-probability; scientific rationality lies in critical testing, not inductive confirmation. - Critical rationalism: Rational inquiry proceeds by criticism and testing rather than by building indubitable foundations. Influence and relevance Popper shifted epistemology away from inductivist accounts of science and emphasized the provisional, critical nature of knowledge. His ideas influenced philosophy of science, methodology, and democratic theory (see The Open Society for political implications). For primary source: K. R. Popper, The Logic of Scientific Discovery (1934; English trans. 1959). For commentary: Imre Lakatos, "Falsification and the Methodology of Scientific Research Programmes" (1970).