Nico Rosberg's father has questioned the decision by Mercedes to delay the launch of its 2012 car.
Nico Rosberg, the German-born son of 1982 world champion Keke, has publicly backed his team's approach in not running the W03 in anger until now, a full group test after main rivals Red Bull, McLaren and Ferrari got their new cars up and going.
"There is definitely some risk," said former McLaren and Williams driver Keke Rosberg, 63.
"It's Barcelona and so there could be some snow and the test could even be cancelled.
"Or if it happens to you what happened to Ferrari in Jerez, then you have even a shorter amount of time to fix everything.
"The tests are separated only by days and then there is the last one, and again it could be snowing or raining," added Rosberg. "It's not Andalucia, remember, but the Costa Brava."
Rosberg said the issue for Mercedes and also Ferrari is the risks they are needing to take in order to catch up with last year's pacesetters, Red Bull and McLaren.
"How could Ferrari be having such problems, when without the exhaust gases last year they won at Silverstone?
"Maybe it's because they had to take such a leap, but when you do that there's the risk it will go wrong.
"It's the same for Mercedes, because last year they were in calm waters with a big gap to the top and the middle groups."