2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36850Experimental results on hadronic structures are discussed in view of our physics understanding. Achievements and challenges are noted.Invited opening plenary talk at the 8th Intern. Workshop on Deep Inelastic Scattering and QCD, Liverpool, UK (2000), 15 pagesHigh Energy Physics - Experimenttext