  We discuss experimental aspects related to the $\mathrm{e^+ e^-} \to
\mathrm{Z}\mathrm{Z}$ process and to the search for anomalous ZZV couplings
(V$= \mathrm{Z}, \gamma$) at LEP2 and future $\mathrm{e^+ e^-}$ colliders. We
present two possible approaches for a realistic study of the reaction and
discuss the differences between them. We find that the optimal method to study
double Z resonant production and to quantify the presence of anomalous
couplings requires the use of a complete four-fermion final-state calculation.
