Semi-Leptonic Decays of $B$-Mesons
  Form factors relevant for semi-leptonic $B\to D,\ D^*$ decays are obtained in quenched lattice QCD. Tests of heavy-quark symmetry as well as determinations of the Isgur-Wise function and $|V_{cb}|$ are presented. 
Laurent Lellouch (for the UKQCD Collaboration)