At Jerez Juan Pablo would again have to deal with wet conditions while he continued to work on evaluating various setups for the new FW25. The fastest lap for Juan Pablo was a 1m:29.195, which was over four seconds behind Michael Schumacher in the new F200-GA.

The team would come away pleased with the progress that has been made in regard to Michelin's wet weather tyres, which have been performing very well in comparison to the 2002 tyre.

Juan Pablo's test  Montoya did a solid job in Jerez. Especially the new wet tyres were convincing. As for the new P83 engine it continued to show that its reliability was encouraging.
Also joining the WilliamsF1 team was McLaren who continued development work on the MP4/17D. Both McLaren drivers Coulthard and Raikkonen were present.

At Imola Marc Gene again conducted the test and at the end of the day he would finish with the fastest time, with a best lap of 1m:22.818. He would complete forty seven laps with part of his testing would focus on a new brake system.

WilliamsF1 Test Team manager Tim Newton commented on the days testing: "In Jerez today we evaluated more Michelin tyres and completed detailed chassis and software set-up for Melbourne. Here at Imola we worked also on tyres but also some other systems development."

Jerez Times
Pos Driver Team/Engine Time Laps

1. M Schumacher Ferrari 1:25.616 10/54
2. D Coulthard McLaren Mercedes 1:26.384 3/44
3. K Raikkonen McLaren Mercedes 1:27.010 4/49
4. O Panis Toyota 1:28.725 6/25
5. JP Montoya WilliamsF1 BMW 1:29.195 14/39

Imola Times
Pos. Driver Team/Engine Time Laps

1. M Gene WilliamsF1 BMW 1:22.818 49
2. J Villeneuve B.A.R Honda 1:22.943 20
3. C da Matta Toyota 1:23.127 18
4. A Wurz McLaren Mercedes 1:23.533 31
5. J Wilson Minardi Ford 1:23.934 24
6. J Verstappen Minardi Ford 1:26.352 12