Image above shows an operator in a cabin mock-up of an SAE Class-B vehicle. The three colored surfaces are "iso-accommodation" surfaces showing where the shifter box can be placed and what level of accommodation (drivers can reach the shifter and exert the necessary force) a designer can expect. The designer can expect, for example, that 90% of drivers will be able to perform the task (shifting gears) if the box is located anywhere on the purple surface.