2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44036We review symmetries protecting a zero value for the cosmological constant in no--scale supergravity and reveal the connection between the Multiple Point Principle, no--scale and superstring inspired models.To appear in the proceedings of International Workshop on What Comes Beyond the Standard Model?, Bled, Slovenia, 19-30 Jul 2004High Energy Physics - Phenomenologytext