2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/103082We discuss polaron formation in disordered electron-phonon systems.Lecture notes for the International School of Physics "Enrico Fermi" on "Polarons in Bulk Materials and Systems with Reduced Dimensionality"Strongly Correlated ElectronsLocalisation versus self-trapping: Polaron formation in the Anderson-Holstein modeltext