  The recent data describing the evidence for neutrino oscillations by Super
Kamiokande implies that two neutrinos are very strongly mixed. We ask the
question: can approximate maximal neutrino mixing be natural in unified (GUT or
string) models? We attempt to answer this question in as much generality as
possible. Without specifying a particular model, we are able to show that a
gauged family symmetry can naturally provide the required maximal mixing
between mu and tau neutrinos. The second and third family neutrino mass
eigenstates are almost degenerate with masses of order 0.2 eV.

High Energy Physics - Phenomenology