‘Preferences’ are a pretty big part of our voting system, sometimes the deciding factor in who wins a seat in the election.

So how do they actually work?

We’ve got quick 101 on why it matters how you number your ballot, and some myth-busting about how much power parties have to decide where your preferences go (spoiler: none).

Also, more than 30 retired judges have written an open letter calling for a federal corruption watchdog. Some parties and independents are keen on the idea - but others, not so much.

And climate change is one of the most important issues for voters this election. So how does everyone’s policies stack up?

Guests:

Claudia Long, Hack political reporter

Han Aulby, executive director Centre for Public Integrity

Richie Merzian, the Australia Institute