This book demonstrates the rich diversity of research approaches developed so far within the field of psychology. In this collection of essays, one moves from biomedical aspects to moral dimensions, through various renditions of social psychology. The book is organized into three sections: (I) psychological causes and consequences of killing; (II) The prevention of killing: from interpersonal to international; and (III) personal transformation: from killing to nonkilling. What brings humans to kill each others or themselves? Is a nonkilling society possible? Answers have been attempted, unanswered questions have been raised, and unexplored issues wait for further investigation.