Daniel Hewitt and Shehab Khan from the ITV News election podcast Calling Peston chat to Professor Colin Rallings - he's ITV's election expert and is part of the team that produces the exit poll you'll see at 10pm on election night on December 12.
The poll correctly predicted that the Conservatives wouldn't get a majority in the 2017 election - and you may be surprised by just how much work goes on behind the scenes to come up with the prediction. Colin takes us through it.
New episodes of the Calling Peston election podcast are released every weekday in the run up to the December 12 election.
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