  We summarize recent developments in the understanding of nucleon structure.
New data on F2, R and F2c, over a wide range of Q2 and x, are described.
Conventional leading twist NLO perturbative QCD gives an excellent account of
all the new data with Q2 above a GeV, leaving very little room for either
higher twists or higher logarithms. We summarize the current status of NLO
fits, and the determination of the gluon distribution and the strong coupling
constant from structure function data. Finally we consider some of the
theoretical issues raised by the new data.
