Neutrino Oscillation: Past, Present and Future

After a first part devoted to the description of the main steps in the discovery of neutrino oscillations, in the second part the results of a recent global analysis of solar, reactor, accelerator and atmospheric neutrino oscillation experiments is reported, searching for the first indications about the still unknown parameters, the mass hierarchy, the q23 octant and the CP-violating phase d . Concerning the hierarchy, no significant difference emerges between normal and inverted mass ordering. A slight overall preference is found for q23 in the first octant and for nonzero CP violation with sind < 0. In the third part the prospects of the future experimental searches for q13, q13 and its octant, dCP and the neutrino mass hierarchy:sign(Dm 2 ) are briefly discussed.