2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/40696I review some of the main results on hard diffraction, in their relation to QCD, and indicate some of the strengths and weaknesses of the arguments. I also make some suggestions for future work.6 pages, 1 figure, to appear in Proceedings of 9th International Workshop on Deep Inelastic Scattering and QCD (DIS 2001), Bologna, Italy, 27 Apr-1 May 2001High Energy Physics - Phenomenologytext