  At energies that are large with respect to the electroweak scale, the
electroweak corrections to scattering processes involve large logarithms that
have to be resummed to obtain decent predictions. Soft-collinear effective
theory (SCET) has been proposed as a suitable framework to allow for this
resummation, while retaining non-logarithmic corrections in a consistent way.
In this paper, we investigate the approximations needed to use this approach
for the calculation of electroweak corrections to off-shell diboson production
at high-energy colliders. Upon implementing the method into a Monte-Carlo
integration code, we provide resummed predictions for cross sections and
distributions at a 3 TeV lepton collider and a 100 TeV proton collider.
