  We study one loop supersymmetric corrections to precision observables. Adding
LEP2 e ebar --> f fbar cross sections to the data-set removes previous hints
for SUSY and the resulting constraints are in some cases stronger than direct
bounds on sparticle masses. We consider specific models: split SUSY, CMSSM,
gauge mediation, anomaly and radion mediation. Beyond performing a complete
one-loop analysis, we also develop a simple approximation, based on the Shat,
That, W, Y `universal' parameters. SUSY corrections give W,Y > 0 and mainly
depend on the left-handed slepton and squark masses, on M_2 and on mu.
