Background: The Scottish government is expected to win today's vote
published at 14:35 Greenwich Mean Time 22 March 2017
Ms Sturgeon's minority SNP government is asking the Scottish Parliament to back its plans to ask Westminster for a section 30 order, which is needed to make a referendum legally binding.
The government is expected to win today's vote with the support of the Scottish Greens - despite opposition from the Conservatives, Labour and Liberal Democrats.
They argue that most people do not want another referendum, and that it will only lead to greater division and uncertainty in the country.
Ms Sturgeon acknowledged to MSPs that many people do not relish the prospect of another referendum, but insisted that the only alternative was "simply to drift through the next two years, crossing our fingers, hoping for the best while fearing the worst."
She added: "It would mean accepting that at the end of this process we will not even have the option of choosing an alternative path, and that the direction of our nation will be decided for us.
"I do not consider that to be right, or fair. The future of Scotland should not be imposed upon us, it should be the choice of the people of Scotland."