D'Ambrosio has spent four seasons in the GP2 feeder series and is a reserve and test driver at Renault.

BBC: Jerome D'Ambrosio & Esteban Gutierrez win F1 test roles

Perez, the son of a former Mexican F3 champion and whose elder brother is a NASCAR racer, has always been quick -- he showed that in F1's feeder series competitions.

CNN: F1 star Perez gives Mexicans hope

After a dominant year in GP2, the feeder series for F1, in 2006, which showcased the full range of Hamilton's driving skills, McLaren took up their option on him for 2007.

CNN: The man behind Hamilton's F1 dream

U.S. driver Alexander Rossi will remain the second team reserve, but will take over Ma's seat in the GP2 championship -- which is the official feeder F1 series for the next generation of drivers.

CNN: Kovalainen returns to help Caterham F1

The 25-year-old finished runner-up to Glock in the 2007 GP2 Series, F1's feeder competition.

BBC: Lucas di Grassi joins new-look Virgin Formula 1 team

Chilton finished fourth in the GP2 series, which acts as a feeder competition for F1, and showed promise in his two performances in the Marussia car, in a young driver test and in free practice at the Abu Dhabi Grand Prix.

CNN: STORY HIGHLIGHTS

Some providers offer a single, one-size-fits-all or model portfolio, while others offer some customization at the asset allocation level, implemented through a series of proprietary funds-of-funds or feeder funds.

FORBES: CIO Outsourcing: Questions Investment Committees Need to Ask