This book is concerned with whether we can develop our understanding of the mind through the application of new approaches to the study of complex systems. It is divided into two sections. The first is concerned with the application of non-linear systems theory to the psychoanalytic study of the mind. The second is concerned with the technical application of the ideas of chaos theory to the understanding of therapeutic action and psychic change. It concludes with a consideration of the research and clinical implications of considering the mind as a non-linear system.