“Grim and Rescher’s Theory of Categories is a philosophically sophisticated and historically informed study of categoricity in virtually all its aspects. It has insightful treatments of categories in metaphysics, scientific inquiry, philosophical analysis, and other areas, and it is particularly informative on specific issues such as the problem of induction and, throughout, in distinguishing defensible generalities from convenient stereotypes”— Robert Audi, John A. O’Brien Professor of Philosophy, University of Notre Dame, USA.