"Christopher Peacocke's rich, densely argued book is a frontal assault on the task of constructing a theory of concepts. Its argument is a model of rigor: each move is precisely flagged, each claim distinctly articulated.... It is a mark of the best work in philosophy that it deals with deep and central concerns while at the same time reaching beyond itself to fructify debate elsewhere. Peacocke's stimulating book does both these things, and in ways that no future account of its subject matter can ignore."
-- A. C. Grayling, Times Higher Education Supplement

Philosophers from Hume, Kant, and Wittgenstein to the recent realists and antirealists have sought to answer the question, What are concepts? This book provides a detailed, systematic, and accessible introduction to an original philosophical theory of concepts that Christopher Peacocke has developed in recent years to explain facts about the nature of thought, including its systematic character, its relations to truth and reference, and its normative dimension.