The Fixation of Belief and Its Undoing: Changing Beliefs Through InquiryIsaac Levi's new book is concerned with how one can justify changing one's beliefs. The discussion is deeply informed by the belief doubt model advocated by C. S. Peirce and John Dewey, of which the book provides a substantial analysis. Professor Levi then addresses the conceptual framework of potential changes available to an inquirer. A structural approach to propositional attitudes is proposed which rejects the conventional view that a