Head of government
Head of government is a generic term used for either the highest or second highest official in the executive branch of a sovereign state, a federated state, or a self-governing colony who often presides over a cabinet. The term "head of government" is often used differentiating it from the term "head of state", e.g. as in article 7 of the Vienna Convention on the Law of Treaties, article 1 of the Convention on the Prevention and Punishment of Crimes against Internationally Protected Persons, including Diplomatic Agents and the United Nations protocol list. The authority of a head of government, and the relationship between that position and other state institutions (such as a head of state and legislature) varies greatly among sovereign states, depending largely on the particular constitutional model chosen.