A more thorough explanation:

A plurinational administrative institution is an organization that performs transnational administrative activities when traditional international agreements and politically oriented international organizations are not suitable. These institutions usually arise in fields where transnational arrangements are necessary, such as natural-resource management, transportation, or utilities. They can be organized as international corporations, national agencies, or private corporations.

• The International Atomic Energy Agency (IAEA) is a plurinational administrative institution that promotes the peaceful use of nuclear energy and works to prevent the spread of nuclear weapons.
• The International Civil Aviation Organization (ICAO) is another example of a plurinational administrative institution. It works to ensure the safe and efficient operation of international air travel.
• In the field of natural-resource management, the Mekong River Commission is a plurinational administrative institution that coordinates the management and development of the Mekong River basin.

These examples illustrate how plurinational administrative institutions can be created to address specific transnational issues that require cooperation and coordination between multiple countries. They are designed to fill gaps where traditional international agreements and organizations are not effective, and they can take on a variety of organizational forms depending on the needs of the situation.