  We propose a new guiding principle for phenomenology: special geometry in the
vacuum space. New algorithmic methods which efficiently compute geometric
properties of the vacuum space of N=1 supersymmetric gauge theories are
described. We illustrate the technique on subsectors of the MSSM. The fragility
of geometric structure that we find in the moduli space motivates
phenomenologically realistic deformations of the superpotential, while arguing
against others. Special geometry in the vacuum may therefore signal the
presence of string physics underlying the low-energy effective theory.
