Abstract
Gauge symmetries with nonuniversal couplings can manifest themselves in e(+)e(-) collisions via generation-dependent deviations of leptonic observables from the standard model predictions. We analyze the deviations in terms of the lepton couplings to the extra neutral gauge boson and the polarizations of the positron and electron beams. We show how the proper manipulation of both the nonuniversal couplings and the applied beam polarization can result in considerable improvement in the differentiation of the corresponding models and in the identification reach of the extra nonuniversal gauge boson.