Mercedes motorsport boss Norbert Haug has said stability will be keen if the Silver Arrows is to become a contender for victories in F1.

In its second season since taking over Brawn GP, Mercedes has again failed to challenge for victories and was unable to launch a challenge on either the drivers' or constructors' championships with its W02.

As part of its attempt to challenge the like of Red Bull and McLaren, the Mercedes has already signed former Ferrari man Aldo Costa and ex-HRT designer Geoff Willis to strengthen its technical team and Haug that was part of the steps that need to be taken to become contenders.

"Our development and our learning will bring us upwards gradually, step by step, from the fourth power at the moment to third, second and ultimately to position number one," he told Eurosport Germany. "This can be achieved only through years of hard and focused work. The current world champions took five years before their first success."

Despite question marks being raised once again about the future of Michael Schumacher earlier this season, Haug added that the current pairing of the seven-time champion and fellow German Nico Rosberg was a vital part of Mercedes' drive for success.

"We are completely satisfied with them, as once we give our drivers a winning car, they will win with it," he said. "Michael is a motivator through and through. He has a plan just as he had one at Ferrari, where he fought for five years for his first title (in Ferrari colours). He has the same bite as ever and remains one of the very best drivers in the field."