Although Mercedes utterly dominated the 2014 Formula 1 world championship, team chairman Niki Lauda is still looking into the new season with trepidation.
For one thing, the F1 legend and triple world champion cannot understand the sport's looming schedule for pre-season testing.
"Everyone at Brackley is stressed," Lauda admitted to Salzburger Nachrichten. "There are many things [to worry about]. It bothers me that this year there is no test in the session of Bahrain, unlike the previous year."
"In Spain, the temperatures are too low in February and then we go straight to the heat of Melbourne. I don't understand this schedule," Lauda added.
He also commented on the winter developments on the political front, with engine makers allowed to upgrade their 2015 engines beyond the original deadline.
"The newcomers Honda also want the same position as the others," said Lauda, "which I understand for reasons of fairness."
Mercedes will begin the defence of their two world titles at the first test in Jerez from 1 February to 4 February, before the season proper begins in Melbourne in March with world champion Lewis Hamilton and Nico Rosberg once again spearheading their campaign.