The UN system is often referred to as a "family" of organizations. The charter of the UN, signed in San Francisco on 26 June 1945, defined six main organs of the new world body, each with specific tasks and functions. However, because it was impossible to foresee all the demands that might be made on the organization, provision was made for extending its capacities as the need arose. Thus, three of the main organs are specifically empowered to establish "such subsidiary organs" as may be considered necessary for the performance of their functions. In addition, Article 57 of the charter provides that the various specialized agencies established by intergovernmental agreement and having international responsibilities in economic, social, cultural, educational, health, and related fields "shall be brought into relationship" with the UN. Since the signing of the charter, the UN has established...