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We review first the parton model formalism for polarized deep inelastic lepton-hadron scattering. Topics discussed include the “spin crisis in the parton model”, the role of the axial anomaly, our knowledge of the polarized gluon number density and attempts to measure it. Secondly, going beyond the simple parton model, we discuss the evolution of parton densities, the generalization of the parton model in QCD, perturbative QCD corrections and scheme dependence. Finally we comment on our knowledge of the polarized strange quark density and attempts to learn about it from semi-inclusive deep inelastic scattering.
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