This said, the national government could, at a minimum, better define the role and relationship of the various planning documents. To improve planning coherence, a clearer definition of the interaction between regional-level strategic and planning instruments (i.e. ERD and PROT) and their municipal level equivalents (i.e. PLADECO and the various Regulating Plans) is needed. This means improving the interaction and co-ordination between regional and municipal authorities, as well as between regional government and line ministries and their SEREMI.