Hadronic Vacuum Polarization Contribution to g-2 of the Leptons and   alpha(M_Z)
  We review and compare recent calculations of hadronic vacuum polarization effects. In particular, we consider the anomalous magnetic moments g-2 of the leptons and alpha(M_Z), the effective fine structure constant at the Z--resonance. 
F. Jegerlehner (DESY-IFH, Zeuthen)