"The subject of this book, symmetries in physical systems, with particular focus on atomic nuclei, is of the utmost importance in modern physical science. In contrast to most treatments, frequently characterized by fearsome formalism, this book leads the reader step-by-step, in an easily understandable way, through this fascinating field. The volume starts from a beautiful and simple introduction to symmetry in the first chapter, stressing the deep relations between symmetry, degeneracies, quantum numbers, and selection rules, and systematically proceeds through the dynamical symmetries of the Interacting Boson Model, quantum phase transitions, a very nice discussion of partial dynamical symmetries (a topic of growing importance), intruder states, mixed symmetry states, bose-fermi models and, finally, to nuclear supersymmetry (different from the fundamental supersymmetry of particle physics). Throughout, the discussion makes frequent and detailed relation to real data in atomic nuclei where many of these concepts have received their most thorough vetting. Owing to the elegant pedagogical approach, this book is remarkably accessible to both theorists and experimentalists. Indeed, I view it as essential reading for experimental nuclear structure physicists. This is one of the finest volumes on this subject I have ever encountered." Prof. R.F. Casten, Yale University