  I first emphasize the importance of searching for nucleon decay in the
context of supersymmetric models. The status of minimal SUSY SU(5) model is
reviewed, which can be definitively ruled out by a combination of
superKamiokande and LEP-2 experiments. Non-minimal models may provide some
suppression in the nucleon decay rates, but there is still a good chance for
superKamiokande. I point out that the operators suppressed even by the
Planck-scale are too large. We need a suppression mechanism for the operators
at the level of $10^{-7}$, and the mechanism, I argue, may well be a flavor
symmetry. A particular example predicts $p \rightarrow K^0 e^+$ to be the
dominant mode which does not arise in GUT models.
