2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/117660We review on the recent developments for the computation of scattering amplitudes, with attention to the on-shell formalisms and unitarity-based methods.4 pages, talk given at IFAE 2006, Pavia, April 19-21 2006High Energy Physics - Phenomenologytext