Description Non-linear models with complicated multi-well shape of potential energy surface represent the common case situation and they are used in many important processes in real systems, such as chemical reactions, phase transitions, nuclear reactions and decay of super-deformed nuclei. There is increasing world-wide interest in non-linear dynamics, and this volume provides a useful reference and guide to the exciting topic of classical and quantum chaos. The book is intended for a wide audience of readers who are familiar with the basics of classical and quantum mechanics.