"The authors give a masterly account of the work on the Sherrington-Kirkpatrick model in the first 85 pages. Such a summary cannot be found elsewhere, and much of our current understanding of the problem is due to the authors of this book and their collaborators".This is an important book, which every physics library should have. It is also good reading for anyone who wants to know about these aspects of the spin glass problem, and why "replica symmetry breaking'' and "ultrametricity'' may be important".Physics Today, 1988" a very useful source of relevant information on the progress achieved by theoretical physicists in the field. It can be helpful also to mathematicians trying to develop a mathematically rigorous counterpart of this theory".EMS, 1999