Mercedes team principal Toto Wolff believes the "biggest key" to securing yet another Constructors' and Drivers' double was making less mistakes than their rivals on Sundays of race weekends.
Ferrari had the quicker car this season, especially in the second half of the campaign; meaning Scuderia were the dominant force on the Saturday, but often messed up their strategy during the Sunday.
However, it was quite the opposite for Mercedes. The Silver Arrows still performed well in most qualifying sessions, but rarely made a mistake during the race on Sunday and this is something Wolff believes was key to securing another double.
"Every championship seems like the hardest," Wolff said to Motorsport.com. "It may be because we are protected by our memory, but certainly this year had its ups and downs.
"We came out of the block very strong, didn't have the quickest package on Saturday for a long time, but we were able to make the least mistakes on Sunday. And that was probably the biggest key to making us win the championship.
"Obviously, for me the highlight is Austin, we came back to old form, winning the title decider with Valtteri (Bottas, race-winner), and winning the championship with Lewis with strong pace is for me, the highlight of the season."