The proliferation of functional international organizations has occurred without adequate reorganization and coordination efforts due to a lack of central global governance to ensure accountability of such organizations. As a result, a pattern of decentralization could be observed among functional international organizations to the present day. Notably, the League of Nations' effort to coordinate functional international organizations in the field of social and economic cooperation through establishment of UN Economic and Social Council has been futile. As a result, the idea of decentralization prevails to the present day except in cases of special cooperative relationships between Economic and Social Council and some functional organizations. Subsequently, summits such as the World Summit for Social Development in 1995, the Millennium Summit in 2000 and Earth Summit 2002 were held to address and coordinate functional cooperation, especially regarding the social and economic aspects.