This book is an analysis of the distinctive form of reasoning, called practical reasoning by Aristotle (as opposed to theoretical reasoning), that serves to guide behaviour. It is a contribution to the literature on practical reasoning and indirectly on its application to action theory. The concept of goal-directed (telelogical) reasoning is central to two fields - artificial intelligence and argumentation. The book brings the two fields together to provide the analysis of their central, common underlying concept of goal-directed practical reasoning. "Practical Reasoning" may be of interest to specialists and graduate students in the field as well as to students in biology, computer science, psychology and philosophy.