 The link between Popper’s theory of knowledge and his social philosophy is his fallibilism. We make theoretical progress in science by subjecting our theories to critical scrutiny, and abandoning those which have been falsified. So too in an open society the rights of the individual to criticise administrative policies will be safeguarded and upheld, undesirable policies will be eliminated in a manner analogous to the elimination of falsified scientific theories, and political differences will be resolved by critical discussion and argument rather than by coercion. The open society as thus conceived of by Popper may be defined as