Article 50 may well be triggered in the coming days - after the European Union (Notice of Withdrawal) Bill has received the Royal Assent - and that can only happen when "ping-pong" is concluded between the two Houses of Parliament. It is going to an interested week ahead!
The House of Commons website states - "The House of Commons will now consider these amendments made by the Lords - a period that is known as ping pong. Time has been set aside on Monday 13 and, if necessary, Tuesday 14 and Wednesday 15 March 2017 for the consideration of Lords amendments."This post links to some of the key documents about Article 50.