This volume brings together some of the most influential contributions to the topic of free will during the past 50 years, as well as some notable recent work. Organized dialectically, the volume covers the relation between necessity, acting freely, and freedom to act otherwise, different accounts of the capacity for free agency and the ways in which it can be compromised, grounds for scepticism about free agency, and discussions of the relation between free will and responsibility. The new edition of this highly successful text will once again provide the ideal introduction to free will.