2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36942A summary of the latest alpha_s results at LEP1 and LEP2 from event-shape predictions at Order(alpha2_s) + NLLA is presented. Later these are compared to measurements obtained using the Experimentally Optimized Scale method. Finally the alpha_s measurement from the 4-jet rate is discussed.6 pages, 4 figures, talk presented at the 30th ISMD, Hungary, October 2000High Energy Physics - Experimenttext