We discuss a three-flavour analysis of neutrino oscillation experiment
s in a simplified framework, motivated by the present phenomenology. W
ithin this framework, a detailed review of all the available solar, at
mospheric, accelerator and reactor neutrino oscillation experiments is
reported, with a particular emphasis on the possible scenarios emergi
ng from the comparison between solar and terrestrial oscillation searc
hes. A brief account of the discovery potentials of future short and l
ong baseline experiments is also given.