Systems thinking is necessarily interdisciplinary, so that the thinkers selected come from a wide range of areas тАУ biology, management, physiology, anthropology, chemistry, public policy, sociology and environmental studies among others. A significant aim of the book is to broaden and deepen the readerтАЩs interest in systems writers, providing an appetising тАШtasterтАЩ for each of the 30 thinkers, so that the reader is encouraged to go on to study the published works of the thinkers themselves.