"Subsidiarity is an organizing principle of decentralisation, stating that a matter ought to be handled by the smallest, lowest, or least centralised authority capable of addressing that matter effectively. The Oxford English Dictionary defines subsidiarity as the idea that a central authority should have a subsidiary function, performing only those tasks which cannot be performed effectively at a more immediate or local level. The concept is applicable in the fields of government, political science, neuropsychology, cybernetics, management and in military command (Mission Command). In political theory, subsidiarity is sometimes viewed as a principle entailed by the idea of federalism."