A behind-the-scenes look at how The Sims 3′s worlds are created has been posted on TheSims.com:
Creating the worlds of The Sims 3 is an exciting process. It takes many talented people and a lot of work to turn a single idea into an entire world. Teams of model makers, concept artists, designers, directors, and animators expand a simple concept into buildings, hairstyles, and everything in between. Together, they create the distinctive looks of The Sims 3!