We all know what a voluntary action is - we all think we know when an action is voluntary, and when it is not. Yet, performing and action and defining it are different matters. What counts as an action? When does it begin? Does the conscious desire to perform an action always precede the act? If not, is it really a voluntary action? This is a debate that crosses the boundaries of Philosophy, Neuroscience, Psychology, and Social Science. This book brings together some to the leading thinkers from these disciplines to consider this deep and often puzzling topic. The result is a fascinating and stimulating debate that will challenge our fundamental assumptions about our sense of free-will.