  A method is described to probe high-scale physics in lower-energy experiments
by employing sum rules in terms of renormalisation group invariants. The method
is worked out in detail for the study of supersymmetry-breaking mechanisms in
the context of the Minimal Supersymmetric Standard Model. To this end sum rules
are constructed that test either specific models of supersymmetry breaking or
general properties of the physics that underlies supersymmetry breaking, such
as unifications and flavour-universality.
