The regions of Taiwan are based on historical administrative divisions.The most widely used definition is from the Council for Economic Planning and Development (經濟建設委員會), Executive Yuan.This division into four regions (tetrachotomy) scheme corresponds to the prefectures under Qing dynasty rule.This scheme is used by the Joint Service Centers (JSC, 區域聯合服務中心) under Executive Yuan (行政院) and the jurisdiction of High Court Branches (高等法院分院) under Judicial Yuan (司法院).[1] The division into six regions (hexachotomy) scheme corresponds to the prefectures under Japanese rule.