Pat Symonds says Williams will head to Australia with "some confidence" as he doubts rivals were sandbagging during pre-season testing.
Williams emerged as one of the strongest teams during the recent Bahrain tests which ended with Felipe Massa quickest off all by a slim 0.020s advantage.
Added to that, the team covered more miles than any of their rivals as the FW36 proved to be very reliable.
"We have done every bit of homework that we can do, and more, so we have to go there [Melbourne] with some confidence," Symonds, Williams chief technical officer, told Autosport.
"On top of which, we have done it at a reasonable pace so we have fully stretched everything.
"We had one gearbox go way beyond its mileage and we've been running a hard pace whether it be with a lot of fuel or a little bit of fuel.
"We have stretched the car at all times, we haven't really limped round so I really hope we have uncovered anything that might have been lurking there."
Pressed as to what his team expected to get out of the Australian GP, Symonds said the target is a solid top ten result.
"A strong points finish, yes I'd certainly hope for that, and really challenging for a respectable position.
"We have run a very genuine winter test programme - what you see is what you get and I suspect that is true for most people.
"Over the last few years, there has been a lot of sandbagging but this year people really needed to see what they are doing.
"And it's not as if anyone has a fuel tank that can run significantly more than proper fuel for a race distance.
"I think people stretched things a bit in qualifying as well, so there might be a few kilograms difference in weights, but not too much."
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