In Lithuania, the type of government is a Unitary parliamentary republic. In Lithuania, the legislative power is vested in a Parliament. The head of the government is Dalia Grybauskaitė. The governmental structure of a country determines the manner in which laws are written, approved, and interpreted. Government type determines the manner in which elections are held as well as the country's system of policing its citizens. The term of office of the head of state in Lithuania lasts until 1 January 2019. The length of a head of state's term has a direct effect on the power and influence of the executive position. A longer term of office provides the head of state with increased authority.