  Precision measurements, now and at a future linear electron-positron collider
(ILC), can provide indirect information about the possible scale of
supersymmetry. Performing a chi^2 analysis, we illustrate the present-day and
possible future ILC sensitivities within the constrained minimal supersymmetric
extension of the Standard Model (CMSSM), varying the parameters so as to obtain
the cold dark matter density allowed by WMAP and other cosmological data. The
current data are in very good agreement with the CMSSM prediction for tan beta
= 10, with a clear preference for relatively small values of the universal
gaugino mass, m_{1/2} \sim 300 GeV. In this case, there would be good prospects
for observing supersymmetry directly at both the LHC and the ILC, and some
chance already at the Tevatron collider. For tan beta = 50, the quality of the
fit is worse, and somewhat larger m_{1/2} values are favoured. With the
prospective ILC accuracies the sensitivity to indirect effects of supersymmetry
greatly improves. This may provide indirect access to supersymmetry even at
scales beyond the direct reach of the LHC or the ILC.
