Political and departmental commitment to ideals and values are the key to many success stories. For integrated and sustainable policies to succeed, the institutional arrangements outlined below need to be supported by dynamic public officials who assume ownership of the process. ###>Il ne s'agit pas uniquement des prescriptions des lois − qui sont généralement sectorielles − et des responsabilités, mais aussi des pouvoirs de décision, limités au-delà des frontières administratives.