2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/20211I review some open problems on the ever-growing field of non-equilibrium phase transitions, paying special attention to the formulation of such problems in terms of Langevin equations or, equivalently, field-theoretical descriptions, and their solution using renormalizationTo appear in the Bulletin of Asia Pacific Center for Theoretical Physics (APCTP). 5 figuresCondensed Mattertext