  We present a bottom-up approach to the question of supersymmetry breaking in
the MSSM. Starting with the experimentally measurable low energy supersymmetry
breaking parameters which can take any values consistent with present
experimental constraints, we evolve them up to an arbitrary high energy scale.
Approximate analytical expressions for such an evolution, valid for low and
moderate values of $\tan\beta$, are presented. We then discuss qualitative
properties of the high energy parameter space and in particular, identify the
conditions on the low energy spectrum which are necessary for the parameters at
high energy scale to satisfy simple regular pattern such as universality or
partial universality.
