Alex Lynn "overdelivered" in his role as a Williams Formula 1 development driver last season, according to the outfit's deputy team principal Claire Williams.
Lynn carried out extensive work in the simulator as well as getting behind the wheel of the 2015 challenger at the in-season test in Spain.
The 22-year-old Briton will contest a second season in GP2 with DAMS but whether he will continue in his Williams role is unclear as the team has yet to decide on its support driver line-up. It has also taken ex-Ferrari protege Lance Stroll under its wing.
"In terms of the job we wanted Alex to do, he has overdelivered," Williams told Autosport.
"Alex is quite a complex character, he thinks a lot about everything that he does.
"He doesn't just go crashing in there, everything is well-considered.
"He has gone through this development programme with us and he's integrated across lots of areas of the business.
"Whether it is working in the simulator or with the guys in the composites, everything he has done, he has really outshone himself.
"The level of maturity for his age is quite impressive."
Lynn made a solid debut in GP2, scoring two victories on his way to sixth in the drivers' standings, and Williams expects him to make a bigger impression this term.
"GP2 was up and down for him last year," she said. "He's had some great moments but also some disappointing moments.
"But it was his rookie year in GP2 and we need to remember that.
"The series by its nature can deliver tough blows to these kids and can blind you to somebody's true performance because of the nature of the grids.
"So in 2016, I think we'll be able to see where Alex is as a driver."