Experimental philosophy is a new movement that seeks to return the discipline of philosophy to a focus on questions about how people actually think and feel. Departing from a long-standing tradition, experimental philosophers go out and conduct systematic experiments to reach a better understanding of people's ordinary intuitions about philosophically significant questions. Although the movement is only a few years old, it has already sparked an explosion of new research, challenging a number of cherished assumptions in both philosophy and cognitive science. The present volume provides an introduction to the major themes of work in experimental philosophy, bringing together some of the most influential articles in the field along with a collection of new papers that explore the theoretical significance of this new research.