In these essays, McCann develops a unified perspective on human action. Written over a period of 25 years, the essays provide a comprehensive survey of the major topics in contemporary action theory. In four sections, the book addresses the ontology of action; the foundations of action; intention, will and freedom; and practical rationality. McCann works out a compromise between competing perspectives on the individuation of action; explores the foundations of action and defends a volitional theory; argues for a libertarian view of both the formation and the execution of intention; and considers the question of consistency in rational intentions, as well as the relationship between practical and theoretical reasoning.