2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45393We present a simple method for considering radiative corrections. Precision data are well described by an adequate Born approximation and only the first evidence for deviations from the tree level formulas and the presence of the loop effects emerge.Plenary talk at ICHEP-94, Glasgow, 10 pages, 9 figures, uses ichep.sty and epsfig.sty. Pictures Unix compressed and uuencoded are at the end of the paperHigh Energy Physics - Phenomenologytext