2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/185137In this talk, I reviewed the role of factorization in diffraction hard scattering.Talk presented at the Ringberg Workshop on ``New Trends in HERA Physics 2001''. 10 pages, 6 postscript figures. Misprints correctedHigh Energy Physics - Phenomenologytext