  Experiments at future colliders will attempt to unveil the origin of
electroweak symmetry breaking in the TeV range. At these energies the Standard
Model (SM) predictions have to be known precisely in order to disentangle
various viable scenarios such as supersymmetry and its manifestations. In
particular, large logarithmic corrections of the scale ratio $\sqrt{s}/M$,
where $M$ denotes the gauge boson masses, contribute significantly up to and
including the two loop level.
  In this paper we review recent progress in the theoretical understanding of
the electroweak Sudakov corrections at high energies up to subleading accuracy
in the SM and the minimal supersymmetric SM (MSSM). We discuss the symmetric
part of the SM Lagrangian at high energies yielding the effective theory
employed in the framework of the infrared evolution equation (IREE) method.
Applications are presented for important SM and MSSM processes relevant for the
physics program of future linear colliders including higher order purely
electroweak angular dependent corrections.
  The size of the higher order subleading electroweak corrections is found to
change cross sections in the several percent regime at TeV energies and their
inclusion is thus mandatory for predictions of high energy processes at future
colliders.
