Charles Leclerc has reverted to a pen and paper to give Ferrari feedback about its 2020 car.
At Sauber and again with Ferrari last year, the 22-year-old used a tablet computer to make notes in the garage to give to his engineers.
But in Barcelona this week, Leclerc was spotted using a notebook and pen, and close-ups revealed he was making notes about things like tyre warm-up and understeer.
He told reporters: "I stopped typing my impressions because I had to scroll too many pages in the evening to find the relevant notes.
"That's why I returned to my old system of pen and notebook. Because we do so many laps on each test day, it helps me to find everything later if I write it down."