Dialectic is a method of investigation which has enjoyed a long history and has been invoked and involved in a great variety of intellectual causes. Aristotle was one of the first thinkers to develop a full theory of dialectic, and his account has remained one of the most influential and philosophically substantial. Dr Evans here offers a systematic account of Aristotle's theory. He explores how dialectic is related to other forms of enquiry, both scientific and philosophical, and demonstrates the central part which dialectic occupies in Aristotle's thought; he establishes the importance and originality of the Topics in which this theory is developed, and contrasts Aristotle's account with those of Plato and the Academy. This book will be of interest to philosophers and historians of ideas as well as to specialists in Greek philosophy. All quotations are translated into English and there is a glossary of key Greek terms.