2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/104566The idea of diffractive processes with a hard scale involved, to resolve the underlying parton dynamics, was presented at the first Blois conference in 1985 and experimentally verified a few years later. Today hard diffraction is an active research field with high-quality data and new theoretical models. The trend from Regge-based pomeron models to QCD-based parton level models has given insights on QCD dynamics involving perturbative gluon exchange mechanisms, including the predicted BFKL-dynamics, as well as novel ideas on non-perturbative colour fields and their interactions.6 pages, 3 figures. Talk at XIth International Conference on Elastic and Diffractive Scattering, Chateau de Blois, France, May 15-20, 2005. To appear in the proceedingsHigh Energy Physics - Phenomenologytext