  Gauge-Yukawa Unification (GYU) is obtained in GUTs by searching for
renormalization group invariant relations among gauge and Yukawa couplings
beyond the unification scale. Of particular interest are two supersymmetric
GUTs, the finite and the minimal SU(5) models. Both models provided us,among
others,with predictions of the top quark mass which so far have passed
successfully the tests of progressively more accurate measurements.
