Product categories often require unique settings for testing. For example, the riding experience in cars or airplanes can be tested in simulators that submit participants to conditions that parallel real conditions. Driving ranges for car testing are roads that simulate various driving conditions--from smooth paved highways, to bumpy, water flooded dirt roads. Flight simulators range from inexpensive, software-based products that are sold to gamers and hobbyists, to very expensive civilian and military aviation devices that replicate the physical condition of any flight condition. Such devices are very effective in training pilots.
The preceding picture shows a few examples of car and airplane cabin simulators that help car designers study the riding experience in a moving vehicle, at a high-fidelity of precision and predictability. Other physical products are ideally tested in conditions that simulate a relevant use case. In addition to simulations, there are other parameters...