Kazuki Nakajima set the pace on what, for most teams, is the final day of testing at Barcelona this week.

After two days of difficult weather conditions, things were much improved today, with drivers able to post some competitive times. Although the session got underway with the track still damp from overnight rain, a dry line soon emerged, allowing the teams to begin their programmes in earnest.

Williams had three drivers on duty, with Nico Rosberg and Nico Hulkenberg in action this morning, before the former A1 GP star handed over to Nakajima in the afternoon. Between them, the Grove trio completed 195 laps, with Rosberg finishing the day fourth quickest, just 0.095s off his teammate's pace.

"We've had plenty of running in the wet this week and we looked pretty good, which was positive," said Rosberg. "It wasn't that easy to drive in the conditions, it's hard to keep the tyres in the working window, especially without traction control, so you're always quite on the limit. The last day was dry and so we managed to cover a lot of laps with no problems at all. Over the three days, we got some important reliability issues sorted out. We seem to be progressing well with the new car and I am happy with the improvements we're making.

"Initially it was a bit of a difficult test because of the weather," added Nakajima, "but it was good for me to get some experience in wet conditions. The car is feeling good, but we couldn't do as much work with it as we wanted to because of the bad weather. It was still a good week for us though overall."

"Although the first two days were wet, the final day was predominantly dry and that allowed us to work on chassis set-up," said Sam Michael. "All three drivers were on hand and the mileage they covered was important for us to get race signoff before the Australian Grand Prix."

After watching from the sidelines on Tuesday and Wednesday, McLaren finally opted to join in the fun today, as Heikki Kovalainen and Pedro de la Rosa got to work.

The Woking duo completed 156 laps in total, both drivers within 0.055s of Nakajima's pace-setting time. That said, Kovalainen experienced a couple of minor problems, stopping out on track twice, once on his installation lap. The main focus for the team today was aerodynamic development tests.

Once again, Felipe Massa and Luca Badoer were on duty for Ferrari, the Maranello outfit continuing with the development work it began yesterday, centred on reliability, electronics, set-up testing and development of new aerodynamic solutions. Between them, they completed almost 200 laps, the Brazilian finishing just 0.060s off Nakajima's pace.

The Italian team will be back in action tomorrow, the only team on duty here.

The damp start to the day allowed Red Bull to practice pit stops, while in the afternoon Mark Webber and David Coulthard were able to continue their Melbourne preparation work. The Australian was sidelined by a minor problem around midday, but was able to continue after a brief spell in the garage. That said, he encountered a further problem about an hour before the end of the session.

Coulthard completed his planned programme, which went very well, his only interruption being the red flag brought out when his team-mate stopped on track!

"This has been a very useful three days, despite the weather," commented Chief Test Engineer, Ian Morgan. "It was the first time this season that we have had the full race crew personnel all attending a test to operate as a team and, as such, it was excellent preparation for Melbourne."