We summarize methods and expected accuracies in
determining the basic low-energy SUSY parameters from experiments at
future e$^+$e$^-$ linear colliders in the TeV energy range, combined
with results from LHC. In a second step we demonstrate how, based on
this set of parameters, the fundamental supersymmetric theory can be
reconstructed at high scales near the grand unification or Planck scale.
These analyses have been carried out for minimal supergravity
[confronted with GMSB for comparison], and for a string effective
theory.
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