Experiments at the Large Hadron Collider (LHC) at CERN will allow for the exploration of an energy range which has never been reached in collider physics up to now. However, extracting signals of new phenomena and discriminating between different models is only possible if the predictions of the Standard Model and of prominent extensions, like e.g. the Minimal Supersymmetric Standard Model,
are known precisely enough.
To this aim higher orders in perturbation theory have to be calculated, in particular one-loop amplitudes for multi-particle production. This should be done in a largely automated way, to provide tools similar to the leading order tools we have at hand today. A general framework for the calculation of multi-particle processes at TeV colliders will be presented and illustrated with examples.