  As a consequence of the large top quark Yukawa coupling, supersymmetric
unified theories with soft supersymmetry breaking terms generated at the Planck
scale predict lepton flavour and CP violating processes with significant rates.
The flavour violating parameters of the low energy theory are derived in both
SU(5) and SO(10) theories, and are used to calculate the rate for mu --> e
gamma. The sensitivity of the search for mu --> e gamma is compared with that
for mu --> e conversion in atoms, tau --> mu gamma and the electric dipole
moment of the electron. The experimental search for these processes is shown to
provide a very significant test of supersymmetric unification, especially in
SO(10) but also in SU(5).
