Williams has confirmed its driver schedule for this week's opening F1 test of the season at Jerez.

Pastor Maldonado will hit the track for the opening two days of the four-day test on Tuesday and Wednesday before Valtteri Bottas takes over on Thursday and Friday for his first outings as a race driver.

The Grove-based team will be the only one to run its 2012 car at Jerez, having elected to launch the FW35 in Barcelona prior to the second test of the off-season.

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As such, the focus for this week's test will be on continued development work on parts that will feature on the new car when it breaks cover on 19 February.

"As part of our preparations for the 2013 season, we took the decision to launch our FW35 in Barcelona for a number of reasons," technical director Mike Coughlan said. "We have already spent a great deal of time rig testing key areas of the new car for reliability, including doing over 3000kms on the gearbox and rear suspension and 7000kms on our 2013 KERS, and we are happy with the results we have seen. Our cars also passed all mandatory crash tests for 2013 and so were fully FIA homologated earlier this year.

"Our focus for track testing is to work on developing our aerodynamic package with extra time and resource now being available in the wind tunnel for a further upgraded race package ahead of the Australian GP."