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The production and decay of exotic leptons are discussed in the context ofthe vector singlet, vector doublet and fer\-mion mirror-fer\-mion models, atc.m. energies $\sqrt{s}=190GeV$ (LEP II) and $\sqrt{s}=500GeV$ (NLC). The modeldependence of total cross sections and kinematic distributions at theseenergies is shown to be weak for these three extended models, indicating thatit would be difficult to establish which of them is best fit to describe theunderlying new physics, should exotic leptons be detected. We suggest that, inorder to resolve this difficulty, one should measure the angular distributionsof single exotic leptons in longitudinally polarized $e^+e^-$ collisions.Comment: 11 pages, 10 Figs, LATeX, Preprint IF-UFRJ/9

Single heavy lepton production in high energy electron-positron collisions