  We study the implications of neutrino oscillations with maximal mixing for
the neutrino Dirac and Majorana matrices in the see-saw mechanism for three non
degenerate neutrino masses. We find the form of the Dirac matrix for a
structure-less Majorana matrix and, conversely, the structure of the Majorana
matrix if the Dirac matrix is according to our naive intuition. We give some
examples of Majorana matrices that, in a 3 X 3 context, lead to maximal mixing
without too much fine tuning and cross talk with the Dirac input.
