The talk covers the topics of deep inelastic muon and neutrino scattering, the photon structure function, hadronic muon pair production, and aspects of hight pT hadron-hadron reactions. For deep inelastic lepton scattering, the emphasis is put on a critical comparison of different experiments, the flavour decomposition of the nucleon structure functions and the confrontation of the measurements with QCD. A special chapter is devoted to the determination of the gluon distribution.