  We parameterize the non-universal couplings of t-t-Z and t-b-W in the
electroweak chiral lagrangian approach, and examine the constraints on these
parameters from the LEP data. We also study how the SLC, Tevatron, LHC and NLC
can improve the measurement of these couplings. Different symmetry breaking
scenarios imply different correlations among these couplings, whose measurement
will then provide a means to probe the electroweak symmetry breaking sector.
