Abstract

Popper’s three world doctrine, it has been argued by Peyerahend and Krige, is a rejection of the type of critical dualism of facts and norms articulated in The Open Society. Peyerabend argues further that world 3 acts as a methodological prison designed to restrict the free decision of the individual theoretical scientist. It is my position that Popper's concept of world 3 is not a rejection of critical dualism but rather an attempt to allow for the existence of free normative decisions within the context of a binding tradition. The key to understanding this move is the notion of an objective norm. Specifically I argue that Popper's pluralistic epistemology is based on a traditional many-levelled semantics developed originally to combat psychologism and used now to place the issue of the choice of methodological norms within the framework of a theory of tradition.