This volume explores the principles that govern moral responsibility and legal liability for omissive conduct. Many of this book's contributors try to make sense of the possibility of moral responsibility for omissions, including those that occur unwittingly. The disagreements among them concern the grounds of moral responsibility in these cases: the constellation of states and traits that constitute the self, or the quality of one's will, or exercises of evaluative judgment, or the ability and opportunity to avoid the omission, or the tracing back to a time when one had the witting ability...