From the reviews of the second edition: "This book is an expanded and updated version ... from a previous edition and reviews results on the manifestation of chaos in classical and quantum mechanics. ... A very wide range of topics is covered in the book, which thus can be used as preliminary reading for research areas ... . The book can also be considered as a helpful companion both for mathematicians and for physicists. ... Many technical details and background notions can be found in a rich complement of appendices." (Guido Gentile, Mathematical Reviews, Issue 2006 c)