Another and presumably more realistic way of using of the family S U ( 2 ) F symmetry is based on the picture that, in the absence of flavor mixing, only the particles belonging to the third generation ( t , b , τ τ ) have non-zero masses. The masses and the mixing angles of the light first and second families being doublets of the S U ( 2 ) F symmetry appear then as a result of the tree-level mixings of families, related to spontaneous breaking of this symmetry. The VEV hierarchy of the horizontal scalars are then enhanced by the effective cut-off scale involved. Again, as in the above U ( 1 ) F symmetry case, the family mixings are eventually turned out to be proportional to powers of some small parameter, which are determined by the dimensions of the S U ( 2 ) F family symmetry allowed operators. This finally generate the effective (diagonal and off-diagonal Yukawa couplings for the light families in the framework of the (ordinary or supersymmetric) Standard Model.