2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/19960I briefly review the three nonperturbative methods for the treatment of disordered systems -- supersymmetry, replicas and dynamics -- with a parallel presentation that highlights their connections and differences.Proceedings of the Inhomogeneous Random Systems, Cergy 2002; to appear in Journal of Markov Processes and Related FieldsStatistical Mechanicstext