mrspoonsi writes "The Xbox One controller went through many radical designs, including a built-in pico projector and a cartridge designed to release smell. Apparently, 'the core base didn't appreciate them,' so these wacky features were dropped in favor of a standard controller. According to VentureBeat, over $100 million worth of research went into the design they ended up using. 'Microsoft’s first tweaks for a new controller focused on the overall size and how it’d fit into hands, golden or otherwise. Using the Xbox 360 controller as a starting point, the engineers would make plastic-molded or 3D-printed prototypes that were each 1 millimeter wider or narrower than the last, testing a full range of up to plus or minus 8 millimeters. “That gave us the ability to test, with actual users including women and children, which width feels best,” said Morris. “We tested with more than 500 people throughout the course of the project. All ages, all abilities.” ... Morris and his team then looked at different thicknesses and shapes of the grips (or “lobes,” as he calls them), plus the angle of the triggers, different styles of analog sticks, and more.'"