We review missing pieces of information about neutrinos and discuss methods of their measurements using oscillation experiments. We focus on the experiments using accelerator neutrinos and large detectors hundreds of kilometers away. Several projects based on powerful conventional beams of neutrinos are prepared for the next decade. We describe two most promising of them, which are T2K in Japan and NO\nu A in North America.

PACS numbers: 14.60.Pq, 14.60.Lm, 95.30.Cq, 95.55.Vj