  Topcolor-assisted technicolor provides a dynamical explanation for
electroweak and flavor symmetry breaking and for the large mass of the top
quark without unnatural fine tuning. I briefly review the basics of
topcolor-assisted technicolor, including major constraints and a general
approach to satisfying them. The main challenge to topcolor-assisted
technicolor is to generate the observed mixing between heavy and light
generations while breaking the strong topcolor interactions near 1 TeV. I argue
that these phenomena, as well as electroweak symmetry breaking, are intimately
connected and I present a scenario for them based on nontrivial patterns of
technifermion condensation. I also exhibit a class of models realizing this
scenario.

High Energy Physics - Phenomenology