  The importance of the mass spectroscopy of the superparticles is emphasized.
It will be shown that the gauge coupling constants give us information on the
GUT-scale mass spectrum once the superparticle masses are known. The gaugino
masses will provide us a model-independent test of the grand unification
irrespective of the symmetry breaking pattern. The sfermion masses carry the
information on the intermediate symmetries, if present. Combining the mass
spectrum, we will be able to distinguish among the GUT models, and hopefully
supergravity models also.
