A formidable and intelligent account of the (partial) Hilbert-space formalization of quantum mechanics and the inevitable philosophical ambiguities that result… A marvelous book.

The power and elegance of the quantum-mechanical arguments are excellently portrayed and the reader…could not help being impressed by the sheer intellectual beauty of the subject.

[This book] complements the material covered in standard textbooks on quantum theory, in which the issue of interpretation of the theory is too often neglected.

Hughes has written the best self-contained introduction to the foundations of quantum mechanics yet to appear… Hughes is clearly a gifted teacher, and a casual look at the book may suggest that it is primarily a textbook. In fact, a definitive interpretive perspective is developed throughout the book.