 Burley’s change of mind about universals was brought about by Ockham’s critique of the traditional realist conception, which demonstrated that the common moderate realist account of the relation between language and the world is inconsistent. There is no sign in Burley’s works prior to 1324 that he regarded Ockham as an opponent, but beginning with the prologue to his final commentary on the Physics (a work presumably rewritten in response to Ockham’s criticisms), his main writings on logic and metaphysics always feature an analysis of Ockham’s views together with a serious attempt to refute his arguments.