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The physics impact of measuring the generalized Drell‐Hearn‐Gerasimov integral in inclusive deep inelastic scattering (DIS) is discussed. Studies of the transition region from the real‐photon point into the DIS region have been performed simultaneously in and beyond the nucleon‐resonance region, thereby testing the duality concept. HERMES measurements on the proton and deuteron show consistently that the hard regime holds down to photon virtualities of about 1.5 GeV 2.

We discuss the quark transversity distribution function and a possible way to access it through the measurement of single spin azimuthal asymmetry in semi-inclusive single pion electroproduction on a transversely polarized target., 5 pages, Latex using aipproc.sty (included), to appear in proceedings of "Second Workshop on Physics with an Electron Polarized Light Ion Collider", Sept. 14-16, 2000, MIT, Cambridge, USA