The Secretary General of NATO has the chief civil service of the North Atlantic Treaty Organization, represented by an international diplomat. He is responsable for several important tasks, such as: chairing meetings with committees and spokesperson of NATO, but military, strategy and political decisions are responsabilty of member states.
All three of these branches deals with different parts of the government, also known as a separation of powers. They were created so that one branch would not become to powerful and become an ultimate ruler.
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The logic of collective action theory is used by many in the political scientists.