2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/40680We discuss the motivation for making predictions for jet cross sections at next-to-next-to-leading order. We describe the theoretical ingredients needed for such a calculation and briefly review the progress in the field.4 pages, Latex with Moriond.sty, one postscript figure, Talk given at 36th Rencontres de Moriond on QCD and Hadronic Interactions, Les Arcs, France, 17-24 Mar 2001,reference addedHigh Energy Physics - Phenomenologytext