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In usual extended technicolor (ETC) theories based on the group${\rm{SU}(N_{ETC}})_{ETC}$, the quarks of charge 2/3 and -1/3 and the chargedleptons of all generations arise from ETC fermion multiplets transformingaccording to the fundamental representation. Here we investigate a differentidea for the origin of SM fermion generations, in which quarks and chargedleptons of different generations arise from ETC fermions transforming accordingto different representations of ${\rm{SU}(N_{ETC}})_{ETC}$. Although thismechanism would have the potential, {\it a priori}, to allow a reduction in thevalue of $N_{ETC}$ relative to conventional ETC models, we show that, at leastin simple models, it is excluded by the fact that the technicolor sector is notasymptotically free or by the appearance of fermions with exotic quantumnumbers which are not observed.

Study of an Alternate Mechanism for the Origin of Fermion Generations