De Interpretatione is among Aristotle's most influential and widely read writings; C. W. A. Whitaker presents the first systematic study of this work, and offers a radical new view of its aims, its structure, and its place in Arisotle's system. He shows that De Interpretatione is not a disjointed essay on ill- connected subjects, as traditionally thought, but a highly organized and systematic treatise on logic, argument, and dialectic.