In a way, Need for Speed Shift is a pretty solid little RPG. Competing in events awards experience points to your career total, which in turn levels you up. You do not have to win an event to get points, though. You still get some experience for competing. That experience is split between precision and aggression, which shapes your driver profile. And then with your winnings, you can upgrade your cars to either suit your current profile or make up for deficiencies, which in turn will help you bank more stars. The interconnected nature of every feature in career mode is exactly why it is so successful.