The executive and administrative authority in Slovenia is held by the Government of Slovenia (''''), headed by the Prime Minister and the council of ministers or cabinet, who are elected by the National Assembly (). The legislative authority is held by the bicameral Parliament of Slovenia, characterised by an asymmetric duality. The bulk of power is concentrated in the National Assembly, which consists of ninety members. Of those, 88 are elected by all the citizens in a system of proportional representation, whereas two are elected by the registered members of the autochthonous Hungarian and Italian minorities. Election takes place every four years. The National Council (''''), consisting of forty members, appointed to represent social, economic, professional and local interest groups, has a limited advisory and control power.