2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/40306I review the most recent progresses in the calculation of four-fermion processes in electron-positron collisions15 pages, invited talk at 15th International Workshop on High-Energy Physics and Quantum Field Theory (QFTHEP 2000), Tver, Russia, 14-20 Sep 2000High Energy Physics - Phenomenologytext