Azimuthal and Single Spin Asimmetries in Deep Inelastic Scattering
  Azimuthal and single spin asymmetries play a crucial role in the study of the spin structure of hadrons in terms of their elementary constituents. Exploiting them to uncover information over subtle distribution and fragmentation functions, which cannot easily be accessed in other ways, is what this talk is about. 
M. Boglione, P.J. Mulders