Matteo Renzi has become Italy's new prime minister by appointment of President Giorgio Napolitano, who asked him to form a new government.
The 39-year-old mayor of Florence has been expected to take over since he engineered the removal of his party rival Letta as prime minister at a meeting of the Democratic Party leadership last week.
Renzi said he expected to lay out full reforms to Italy's electoral law and political institutions by the end of February, to be followed by labour reforms in March, an overhaul of the public administration in April and a tax reform in May.
Some Italians feel that they should have been allowed to vote for a new prime minister.
Al Jazeera's Claudio Lavanga reports from Rome.
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