  We argue that in a wide class of theories the fermion and soft supersymmetry
breaking mass structure is largely determined by the infra-red fixed point
structure of the theory lying beyond the \smp We show how knowlege of the
symmetries and multiplet content of this theory is sufficient to determine the
infra-red structure, illustrating the idea for the case of a simple abelian
family symetry. The resulting structure determines the fermion masses and
mixing angles in terms of a restricted number of parameters.
