  There are good reasons why neutrinos could be Majorana particles, but there
exist also a number of very good reasons why neutrinos could have Dirac masses.
The latter option deserves more attention and we derive therefore analytic
expressions describing the renormalization group evolution of mixing angles and
of the CP phase for Dirac neutrinos. Radiative corrections to leptonic mixings
are in this case enhanced compared to the quark mixings because the hierarchy
of neutrino masses is milder and because the mixing angles are larger. The
renormalization group effects are compared to the precision of current and
future neutrino experiments. We find that, in the MSSM framework, radiative
corrections of the mixing angles are for large \tan\beta comparable to the
precision of future experiments.
