Lectures on Models of Neutrino Masses and Mixings

We present a concise review of models for neutrino masses and mixings with particular emphasis on recent developments and current problems. We discuss in detail attempts at reproducing approximate tri-bimaximal mixing starting from discrete symmetry groups, notably A4. We discuss the problems encountered when trying to extend the symmetry to the quark sector and to construct Grand Unified versions.
Comment: Two lectures given at the Summer Institute 2007, 3-10 August 2007, Fuji-Yoshida, Japan 27 pages, 3 figures