2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45726In this talk I discuss theories of dynamical electroweak symmetry breaking, with emphasis on the implications of a heavy top-quark on the weak-interaction $ρ$ parameter.18 pages, 8 Postscript figures, Latex, uses epsf.sty and ssi.sty, talk presented at SLAC Topical Workshop, Stanford, July 19-21, 1995High Energy Physics - Phenomenologytext