This book explores Plato's implicit understanding of argumentation by reviewing his standing as a logician, rhetorician, and dialectician. The question of his "standing" on these matters is approached on his terms (gleaned from the dialogues) rather than simply from the judgments of commentators. Traditionally, arguments are distinguished as logical, rhetorical, or dialectical, and the source of these distinctions is taken to be Aristotle. This book proceeds on the assumption that Aristotle's tripartite theory of argumentation did not arise in a vacuum and explores the different degrees to which substantive antecedents of parts of that model can be traced to Plato.