2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45209The Donnachie-Landshoff model of diffractive scattering, which accounts for all confirmed diffractive data, is briefly reviewed. The picture emerging from this model is shown to directly contradict that coming from perturbative leading-log s calculations. The inclusion of non-perturbative effects brings the two pictures in closer agreement.11 pages, Preprint McGill /93-35High Energy Physics - Phenomenologytext