2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49622We discuss the sensitivity to four-fermion contact interactions of the process of fermion-pair production at the e^+ - e^- Linear Collider (LC), with E_{CM}=0.5 TeV and longitudinally polarized electron beam. The analysis is based on polarized integrated cross sections with optimal cuts. Beam polarization and optimization are shown to have a crucial role in the derivation of model-independent constraints on the new interactions from the data.6 pages, Latex, contribution to the International Workshop on Linear Colliders (LCWS99), Sitges (Barcelona), Spain, 24 Apr-5 May 1999High Energy Physics - Phenomenologytext