  The increasing precision of the measurements on the proton structure and an
improved treatment of the correlated systematic experimental errors constitute
a major step forward in our understanding of the flavour decomposition of the
proton and the momentum distributions of the various flavours. Together with
theoretical progress on the next-to-next-to-leading order QCD corrections to
deep inelastic scattering processes, the proton measurements already imply a
new level of precision for the strong coupling constant alpha-s. The progress
in the measurements on the quantum fluctuations of the photon allows questions
on the universal properties of hadronic structures to be addressed.
