Electroweak Physics at HERA: Introduction and Summary
  A high luminosity upgrade of HERA will allow the measurement of standard model parameters and the neutral current couplings of quarks. These results will have to be consistent with other precision measurements or indicate traces of new physics. The analysis of $W$ production will complement future results of LEP 2 and the Tevatron. We summarize the main results and conclusions obtained by the working group on Electroweak Physics concerning the potential of future experimentation at HERA. 
R.J. Cashmore (University of Oxford), E. Elsen (DESY), B.A. Kniehl   (MPI and LMU Munich), H. Spiesberger (MPI Munich)