[sizzle]

https://www.autosport.com/f1/news/14...velopment-role

There it is laid out.

Snip
Ferrari made good use of its development team in 2018, bouncing back from difficult Fridays to perform better in qualifying and the race on several occasions.
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The most notable example was the Canadian Grand Prix, where Sebastian Vettel was uncompetitive in Friday practice but went on to qualify on pole and win the race on Sunday.
Asked by Autosport at the 2018 season-ending Abu Dhabi GP how important the right replacements for Giovinazzi and Kvyat (pictured above) would be, Vettel said: "You get the point, it is very important.
"Based on our findings [after practice], we changed the car [for qualifying], both of us did, and it was better and we were happier.
"It's not the first time that this has happened so we're extremely thankful for the guys, taking the time.
"It's not the nicest job on Friday night, especially when you're young, but it's important, it all adds up.