Crucial Concepts in Argumentation Theory is a collection of essays that discuss a series of important issues in the study of argumentation. The essays describe the concepts that are crucial to argumentational research and the various ways these concepts have been approached. The essays explore such issues as points of view, unexpressed premises, argument schemes, argumentation structures, fallacies, argument interpretation and reconstruction, and argumentation in law. Each of the essays provides interested readers with an overview of the literature that can serve as a point of departure for further study.