  In its second phase, LEP has given the unique opportunity to study four
fermion processes never observed before. This papers deals with a preliminary
study of $WW$, $We\nu$, $ZZ$ and $Z\gamma^\star$ production in $e^+e^-$
collisions. Measurement results on $WW$ cross section, $W$ branching fractions,
$WWV$ ($V=Z/\gamma$) anomalous couplings and $W$ average polarization in $WW$
events are presented. Moreover cross section measurements for $We\nu$, $ZZ$ and
$Z\gamma^\star$ production and limits on $ZZZ$ and $ZZ\gamma$ anomalous
couplings are reported. All the results are in good agreement with the Standard
Model expectations.

High Energy Physics - Experiment