2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/185100I shortly review time period of twelve years, 1989-2000, which was devoted to a theoretical support of experiments at LEP and SLC at Z resonance and discuss several directions of possible future work in the field of precision theoretical calculations for experiments at future colliders.11 Latex, including 1 figures. Updated version as appeared in the JournalHigh Energy Physics - Phenomenologytext