Given that it has won the Formula 1 constructors' and drivers championship for the past five seasons, you might think Mercedes would get a bit blase and over-confident - but that's not what I am seeing. What I see is a team pursuing perfection.
Over the past couple of seasons, Mercedes has struggled with cars it described as 'divas'. But it has managed the car more times than it didn't and will have learned a lot from doing so.
While Williams and Renault are struggling to get their cars together in time for a pre-test run, Mercedes made it out for a shakedown at Silverstone five days before the main Barcelona test begins. These few laps will put it ahead of anyone who doesn't do a shakedown, and give Mercedes the chance to check out the car's systems (and, if anything is questionable, react to it and hit the ground running in Spain).