  We present an analysis of the low-energy implications of an intermediate
scale ~10^{11} GeV string theory.
  We mainly focus on the evolution of the physical parameters under the
renormalisation group equations (RGEs) and find several interesting new
features that differ from the standard GUT scale or Planck scale scenarios. We
give a general discussion of soft supersymmetry breaking terms in type I
theories and then investigate the renormalization group running. In the dilaton
domination scenario, we present the sparticle spectra, analyzing constraints
from charge and colour breaking, fine tuning and radiative electroweak symmetry
breaking. We compare with the allowed regions of parameter space when the RGEs
start running at the standard GUT or the intermediate scales, and find quite
remarkably that the dilaton dominated supersymmetry breaking scenario, which is
essentially ruled out from constraints on charge and colour breaking if the
fundamental scale is close to the Planck mass, is allowed in a large region of
parameter space if the fundamental scale is intermediate.
