(S) QUARK MASSES AND NON-ABELIAN HORIZONTAL SYMMETRIES

We present a model of quark and squark masses which is based on a non- Abelian horizontal symmetry. It leads to order of magnitude relations between quark mass ratios and mixing angles and to the successful exac t relations in theta(C) = square-root m(d)/m(s) to better than 20% acc uracy. The non-Abelian symmetry also ensures the necessary squark dege neracy to suppress FCNC mediated by loops with squarks and gluinos, in the neutral meson systems.