  The possibility that the interactions of the third generation of quarks and
leptons may violate universality by a small amount remains an open experimental
question. The model of Li and Ma, which naturally accommodates such violations,
is found to be highly constrained by newly obtained, high precision electroweak
and $\tau$-lepton data once full Standard Model radiative corrections are
incorporated into the analysis. A comparison of the predictions of this model
with existing data and the expectations for future colliders is presented.
