How do we react to change? How can we better experience change and change ourselves? How can we initiate and facilitate change in an organization? The literature on change is almost exclusively limited to experiences of change. The authors tell of a context, the tools they used and the results they obtained. As interesting as these stories are, for those who want to understand why they succeeded, failed, or simply why it is so difficult to change, one essential question is obscured: What are the origins of change? The scientific literature offers more and more studies and theories that can help us understand the mechanisms of change. It is in the meeting of cognitive sciences, psychology, biology, sociology or anthropology that we can find the keys. By creating a bridge between the tools of change and the scientific literature, this book offers a new perspective on understanding change, its origins and the relevance of the tools used to change oneself or to provoke change.