2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/40963This talk describes how modern theories of dynamical electroweak symmetry breaking have evolved from the original minimal QCD-like technicolor model in response to three key challenges: R_b, flavor-changing neutral currents, and weak isospin violation.9 pages, 10 figures, RevTeX4.0. Talk given at Snowmass 2001; typo corrected, references added; reference addedHigh Energy Physics - Phenomenologytext