  We discuss in detail different future long baseline neutrino oscillation
setups and we show the remarkable potential for very precise measurements of
mass splittings and mixing angles. Furthermore it will be possible to make
precise tests of coherent forward scattering and MSW effects, which allow to
determine the sign of $\Delta m^2$. Finally strong limits or measurements of
leptonic CP violation will be possible, which is very interesting since it is
most likely connected to the baryon asymmetry of the universe.
