To address the needs of the polity, the state sets up public bureaucratic structures which focus on specific social and economic sectors of the nation. In the case of large domains, the standard bureaucratic units become ministries or departments. For narrower concerns, the state usually creates commissions or bureaux. Newer issues are also incorporated into governmental bureaucracies through small units, which may expand over time depending on the perceived importance of these issues. Interested parties expect that the existence of such units will facilitate governmental action as well as maintain public concern. Behind the creation of bureaucratic units there is a Weberian justification that specialization and action on the basis of rational principles will enhance the efficiency of government.