“A trail-blazing book”-Association of Advertisers, The Netherlands. “Meant to be a catalyst for a paradigm shift in the social sciences”-Ruud Abma, University of Utrecht, Quarterly Psychology & Society. The Netherlands, “A new conceptual framework … a stimulating interdisciplinary journey that challenges underlying theories ... Recommended” -R.A. Logan, University of Missouri – Columbia, Choice, USA. “Most readable book … Creative strategy to introduce the fundamentals of complexity theory science to beginners -Shelton A. Gunaratne, Journal of Communication, USA “I love this book, because it effectively relativizes the row of books next to it on the bookshelf” -Cees van Woerkom, University of Wageningen, Monthly Communicatie, The Netherlands This book introduces principles of Chaos theory (and Complex Adaptive Systems) to social science, in a lively and elegant way. It applies it to the twin disciplines ofmass psychology (under social psychology, mostly in Europe) and collective behavior sociology (mostly in North America) that deal with emergent psychosocial phenomena that lie outside conventional approaches. Each of the eleven chapters begins with a topical ‘case study’ section, on an issue related to climate change and collective behaviour, such as the ‘school strike’ by Swedish schoolgirl Greta Thunberg, the Hollywood movie The Day After Tomorrow, and more. This book aims to show that there are fundamental reasons why many phenomena cannot be easily ‘measured, predicted and controlled’, and thus we need to familiarize ourselves with alternative ways of thinking about them. Jaap van Ginneken is a Dutch author, specialised in science studies, collective behaviour sociology and mass psychology. He has published some 25 books, the 10 major ones also translated into English. Earlier forerunners of this book were widely hailed as very innovative - yet highly readable.