  The expected high sensitivities of future neutrino oscillation experiments
will allow precision tests of unified theories of flavour. In order to compare
GUT scale predictions for neutrino masses, leptonic mixing angles and CP
violating phases with experimental results obtained at low energy, their
renormalization group running has to be taken into account. We discuss the
running in seesaw scenarios, present analytical approximations as well as
numerical tools, and compare the size of the running effects with the expected
experimental sensitivities.
