Deep Inelastic Lepton-Nucleon Scattering

Experiments on deep inelastic scattering have demonstrated the validity of the electroweak theory and the quark structure of nucleons. Experiments are in the process of testing the predictions of QCD. The fundamental Bjorken sum rule has not yet been tested, but the recent measurement by EMC may well lead to a new understanding of the nucleon spin among the constituents. Neutrino experiments will have to reach a new level of precision to distinguish between competing theoretical models.(AIP)