This book covers various experimental and theoretical aspects of multiparticle production in high energy interactions from lepton–lepton, lepton–hadron, hadron–hadron, hadron–nucleus and heavy ion collisons. This is the first time that data from CERN LEP, FNAL, DESY, BNL AGS, CERN SPS and BNL RHIC have been collected in a single volume. Not only accelerator-induced reactions but also cosmic ray interactions of very high energy are discussed, and the up-to-date theoretical interpretations are summarized.