The leaders now have a chance to cross-examine each other.
Alistair Darling asks Mr Salmond for his Plan B on currency - a subject that dominated the previous televised debate.
Scotland's First Minister begins asking his opponent about child poverty and cuts to disabled benefits.
With just a few weeks to go until the Scottish independence referendum takes place, here are some key facts about the vote.
An investigation has been launched after listings appeared on eBay offering to sell votes in the upcoming Scottish independence referendum.
Bounce for leaving the union following second debate this week, but only 43% expected to vote yes in referendum on September 18