Typically the last test of Formula 1's pre-season is about the teams learning their cars and working through race and qualifying simulations.
It's the chance to fit the majority of the upgrades ready for the first race, and we've seen developments on every car this week.
There is a chance that some teams might add a few surprises on the final day, but it's just as likely the better resourced teams will bring new aero parts directly to Melbourne, safe in the knowledge their simulations will be accurate.