2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42115I report on a formalism introduced recently to combine parton shower Monte Carlo's and next-to-leading order QCD computations.4 pages Latex. Invited talk given at XIV IFAE, 3 - 5 April 2002, Parma, ItalyHigh Energy Physics - Phenomenologytext