Preface More than two decades of intensive studies on nonlinear dynamics have posed the question on the practical applications of chaos. One of the possible answers is to control chaotic behavior in such a way as to make it predictable. Indeed, nowadays the idea of controlling chaos, which we try to explain in this book, is an appealing one. This book anized as follows. In Part I (Chapters 1-5) we describe basic methods of controlling chaos, while in Part II we reprint fundamental contributions to this field. In Chapter 1 we give basic information about controlling procedures. Ideas of feedback and nonfeedback methods as well as of chaos synchronization are explained. Additionally, we describe Chua's circuit (a very simple electronic device) which will be used in several examples in the following chapters. Chapter 2 describes feedback controlling methods in which unstable periodic orbits embedded in the chaotic attractor are stabilized. We discuss the Ott-Grebogi-Yorke and Pyragas methods and their connections with classical controlling methods. The method of controlling chaos by chaos, in which chaotic behavior can be modified by coupling via a feedback loop with another chaotic system, is also mentioned. Nonfeedback methods are explained in Chapter 3. This approach is inevitably much less flexible than feedback methods, but in many practical systems it is easier to apply. We give methods in which chaos can be controlled through operating conditions or by system design. Additionally, taming chaos, entrainment and migration control procedures are discussed. The synchronization chaos procedures of Chapter 4 allow two chaotic systems to have exactly the same response. The procedures of Pecora and Carroll and of continuous control are described. We also explain the idea of munication. In Chapter 5 we discuss the problem of the selection and engineering implementation of the chaos controlling method for a