Call it a miracle or a nasty shock, but almost no-one saw the election result coming. So how did the polls fail to predict the Coalition's victory? It's just the latest in a string of polling failures globally, including the failure to predict Donald Trump's victory in the 2016 US Presidential election, and the outcome of the Brexit vote. But Australian polls, at least at a federal level, had been relatively reliable. Until now. So what's changed? Can the problem be fixed? And what are the consequences if it can't? Featured: Annabel Crabb, ABC political journalist Dr Kevin Bonham, independent polling analyst