Electroweak Precision Tests with a Future Linear Collider

Future high energy linear electron positron colliders with centre-of-mass enegies between 90 and 1000 GeV offer a unique opportunity to study precisely the Standard Model and phenomena from new physics. Most important, the mechanism of electroweak symmetry breaking can be established in full depth if one or more Higgs bosons are observed. Precision measurements of electroweak processes open a window into the multi-TeV energy range for searching for new physics, which is of particular importance if no light Higgs boson is observed.