This book is an introduction into the reductionism-holism debate, for aspiring as well as accomplished scientists. It is intended for those working in, or preparing for, research in any scientific field-ranging from the physical sciences to the life sciences to the behavioral sciences and the social sciences. It is certainly not meant for people specialized in areas dealing with the specific issue of reductionism in a strict philosophical sense; they won't learn much new from this book. In other words, this is not a monograph with specialized, original research, but rather an initiation into the debate-more like an introductory textbook, if you will.