  An introduction and summary is given of the main results achieved by working
group 1: Structure Functions in Deep Inelastic Scattering at HERA. The
prospects were discussed of future measurements of the structure functions
$F_{2}, F_{L}, xG_{3}, F_{2}^{Q\overline{Q}}$ and $F_{\pi}$ at HERA. The
results represent a long term programme of experimentation with high
luminosity, different lepton beam charges, proton and deuteron beams, allowing
for precision measurements. The theoretical investigations focussed on QED
corrections, higher order QCD corrections for different observables,
resummation of small $x$ contributions, and the detailed understanding of NLO
QCD evolution codes, to allow for a high precision analysis of the forthcoming
deep inelastic data.
