"From the earliest days of the theory, confusion about its interpretation engendered a continuing series of debates... Ghirardi's book provides a careful, evenhanded and well thought-out introduction to this timely topic."--Peter Woit, American Scientist "This is an excellent translation of a magnificent book... [T]he Italian physicist GianCarlo Ghirardi gives a non-technical and critical exposition of deep facts about the foundations of quantum mechanics."--Adonai S. Sant' Anna, Mathematical Reviews "[A] sweeping treatment of one of the most unfathomable yet important scientific frameworks of our time."--Cait Goldberg, Science News "A modern overview of the state of quantum theory... The breadth and depth are very impressive."--Choice "This remarkable book provides a careful and nontechnical introduction to the fundamental epistemological questions of quantum mechanics... [I]t sets out with an in-depth discussion of the conceptual revolution brought about by the transition from a classical to a quantum description of the physical world... All in all a marvelous and thought provoking book by one of the leading scientists in the field."--M. Kunzinger, Monatschefte fur Mathematik