The opening day of testing at Jerez for the 2012 Formula One season saw all 12 teams taking part. Red Bull Racing, who have won the constructors' title for the last two years, were represented by Mark Webber.
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Ferrari are hoping for a return to form after a dismal 2011 in which they only triumphed once. Felipe Massa, driving the car on the opening day in Jerez, has not won a race since 2008, and his last podium was 21 races ago.
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McLaren-Mercedes are one of the few teams not to have committed to the high-nose design that the majority of the F1 field have gone with for 2012.
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Jenson Button will be hoping to bring his excellent form in the second half of 2011 – eight podiums from the last nine races, including two wins – into the new season as he drives for a third year at McLaren-Mercedes.
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Heikki Kovalainen puts the Caterham through its paces in Jerez. Caterham are the artists formerly known as Team Lotus.
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Nico Rosberg will be hoping this year's Mercedes GP car will give him the chance to break his victory duck. The German has raced 108 times without tasting victory in Formula One.
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October 2004 was the last time that the Williams team won a grand prix. While they not expected to challenge for honours this year, Pastor Maldonado (driving the car) and Bruno Senna will hope to win more than the meagre five points the team picked up in 2011.
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Kimi Raikkonen is back in Formula One after a two-year break, spent competing in the World Rally Championship. The 2007 world champion is competing for Lotus, who went under the name Renault last season.
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Sauber driver Kamui Kobayashi's ambition this season will be to get on the podium for the first time – becoming only the third Japanese driver to do so.
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Daniel Ricciardo did enough in half a season at the Hispania Racing Team to be chosen to drive for Toro Rosso this season.
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After dominating the 2000s, Ferrari have won just six of the last 38 races and will look to improve on that statistic this season.
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Formula One teams take their 2012 race cars to the track in Jerez, Spain, for the first day of testing.
