This book is the second of two volumes that together give a comprehensive introduction to the theory of cooperative behavior in active systems. This volume is devoted to the properties of the complex chaotic patterns that can arise in distributed active systems. The reader will encounter strange attractors, fractals, discrete maps, spatio-temporal chaos etc., and will learn how these phenomena relate to the emergence of complex and chaotic patterns. Examples are treated in detail. For this edition the chapter on turbulence in distributed active systems has been rewritten and one on the control of chaotic behaviour has been added. The second edition contains much new material and has been thoroughly revised.