Predictions for Fermion Pair Production at e+e- Colliders
  We discuss the status and some ongoing upgrades of the ZFITTER program for applications at e+e- colliders LEP1/SLC, LEP2, GigaZ, and TESLA. The inclusion of top quark pair production is under work. 
M. Jack (1), A. Hoefer (1), A. Leike (2), T. Riemann (1) ((1) DESY,   (2) LMU Munich)