2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/112493In this talk I review some challenges which await perturbative QCD at the Large Hadron Collider. In particular, I consider the underlying event, Monte Carlo methods and next-to-leading order (NLO) calculations.4 pages. To appear in the proceedings of 41st Rencontres de Moriond: QCD and Hadronic Interactions, La Thuile, Italy, 18-25 Mar 2006High Energy Physics - Phenomenologytext