Italian political institutions are facing serious challenges keeping up with complexity of governing. Constitutional reform (1999-2001) delegated to Regions legislative and administrative powers designing a form of government that emphasizes the distinction of roles between Regional Cabinet responsible of government and Regional Council responsible of control role and oversight on policymaking. Reform lead Regional Councils to behave as decisional parliament structuring their support staff improving operational and professional structures as consulting staff and design mechanisms of governance that necessarily imply the relationship and interdependence between politicians and administrators. Mechanisms of governance and organization drawn by organizational design of parliamentary administrations, strategic choices about model of parliament and its support staff may shape the relationship between politicians and administrators along a continuum redesign of boundaries between separation and overlapping of roles, from separate to a complementary relationship.