This is not just a straightforward update of a successful book, it is a major rewrite, the most comprehensive revision so far. It covers all significant developments of the past 15 years; equally important, it has  been thoroughly reorganized, such that the discussion is now firmly  embedded into the classification of particles and forces of the Standard  Model. A welcome addition are two new chapters which treat 'Physics beyond  the Standard Model' and 'Particle physics and cosmology' in much more  detail and present the relevance of particle physics in a wider scientific  context.<br>Rüdiger Voss /CERN<br>A complete review is available in CERN  Courier, June 2000