  The Standard Model does not explain the hierarchy problem. Before the
discovery of nonzero lepton mixing angle {\theta}13 high hopes in explanation
of the shape of the lepton mixing matrix were combined with non abelian
symmetries. Nowadays, assuming one Higgs doublet, it is unlikely that this is
still valid. Texture zeroes, that are combined with abelian symmetries, are
intensively studied. The neutrino mass matrix is a natural way to study such
symmetries.
