After the comments from various WilliamsF1 team members regarding the FW25's aerodynamics the team was in full swing trying to further develop the new car. For Ralf the day would focus on completing a race simulation. The day would start wet but would dry off late morning allowing the team to work through their test programme.

By the end of the day Ralf would have completed one hundred laps of the Jerez circuit, without any problems. His best time, a 1m:20.795, would see finish the day fifth fastest behind McLaren's Kimi Raikkonen. The team would try various aerodynamic setups on the car.

At Imola Marc Gené, using the old FW24, would wrap up the teams testing, completing eighty laps and finishing ahead of McLaren's Alexander Wurz and Toyota's Ricardo Zonta, with a best time of 1m:22.650. BAR driver Jacques Villeneuve was faster on this day.

WilliamsF1 Test Team Manager Tim Newton said: "We managed a quality endurance run in Jerez which was helpful. We've finished now in San Marino so there is just one more day of testing for us (Ralf in Jerez tomorrow) before Melbourne."

Jerez Times
Pos Driver Team/Engine Time Laps

1. O Panis Toyota 1:19.077 54/55
2. L Badoer Ferrari 1:19.578 107/113
3. D Coulthard McLaren Mercedes 1:20.043 56/68
4. K Raikkonen McLaren Mercedes 1:20.736 24/40
5. R Schumacher WilliamsF1 BMW 1:20.795 70/100

Imola Times
Pos. Driver Team/Engine Time Laps

1. J Villeneuve BAR Honda 1:21.393 17/55
2. M Gene WilliamsF1 BMW 1:22.650 66/68
3. A Wurz McLaren Mercedes 1:22.925 38/41
4. R Zonta Toyota 1:23.678 33/37