The national, transnational and international non-profi t sector has virtually exploded in size over the last four to fi ve decades. In contrast to the non-governmental non-profi t organizations (NGOs) active at the national level operating under the respective national legislation, the transnational and international non-governmental non-profi t organizations (INGOs) derive their legitimacy from three postulates. First of all, they are presumed to contribute to the creation of global governance and thereby to the democratization of the international system. Second, they have a role to play in terms of both the input and output legitimacy of politics internationally. This means that, on the one hand, they participate in the policymaking processes through the representation of specifi c preferences and their expertise (input legitimacy), and on the other, that these organizations contribute to the provision of goods and services that states do not provide or only provide to a limited extent (output legitimacy). International NGOs advocate and provide public goods but, unlike trade unions or business organizations, do not act in the name of, or for, their specifi c constituency, in other words their members. They defi ne their specifi c target group as the poor, women and children, as the victims of natural disasters and armed confl icts or as endangered species.