"This textbook represents an amazing achievement in my view, both in terms of the breadth of the subject matter, which is vast, and the depth provided where necessary. Having reviewed the manuscript, I have already decided to offer a year-long graduate seminar at my university based on the text. I will also be adopting the text for other courses to augment or replace other sources. Some of the things I especially like about the text include its organization, its many illustrations, and its liberal use of "Question Boxes" that ask provocative questions of the reader. Although I've been a systems scientist for my entire career from the early 70's to now, every time I pick up the manuscript and start reading, I learn new things." -Wayne Wakeland, Ph.D., Professor and Systems Science Program Chair, School of the Environment, College of Liberal Arts and Sciences, Portland State University, Portland, Oregon, USA <"This book is interdisciplinary science at its best. While Systems Science is interdisciplinary at its core, it can be self-referencing in terms of methods and approach. Instead, Mobus and Kalton take a broad approach, exploring many of the most exciting scientific areas that must deal with complexity and causal interconnections, from system dynamics to network science. It is a walk through a series of fascinating discoveries in which the authors manage to be both exhaustive and clear. I found this book to be truly an experience!" -Ugo Bardi, Professor, University of Florence, Italy; Author, Extracted, 2014