<unk>  is the<unk>  of buildings, products or environments to make them accessible to all people, regardless of age, disability or other factors. The term<unk> " was coined by the architect Ronald Mace to describe the concept of<unk> ing all products and the built environment to be aesthetic and usable to the greatest extent possible by everyone, regardless of their age, ability, or status in life. However, it was the work of Selwyn Goldsmith, author of<unk> ing for the Disabled (1963), who really pioneered the concept of free access for people with disabilities. His most significant achievement was the creation of the dropped curb – now a standard feature of the built environment.<unk>  emerged from slightly earlier barrier-free concepts, the broader accessibility movement, and adaptive and assistive technology and also seeks to blend aesthetics into these core considerations. As life expectancy rises and modern medicine increases the survival rate of those with significant injuries, illnesses, and birth defects, there is a growing interest in<unk> . There are many industries in which<unk>  is having strong market penetration but there are many others in which it has not yet been adopted to any great extent.<unk>  is also being applied to the<unk>  of technology, instruction, services, and other products and environments. Curb cuts or sidewalk ramps, essential for people in wheelchairs but also used by all, are a common example. Color-contrast dishware with steep sides that assists those with visual or dexterity problems are another. There are also cabinets with pull-out shelves, kitchen counters at several heights to accommodate different tasks and postures, and, amidst many of the world's public transit systems, low-floor buses that "kneel" (bring their front end to ground level to eliminate gap) and/or are equipped with ramps rather than on-board lifts.
Universal design
Adaptive design 
Integrated delivery system
Scientific method
Real world evidence
Exposure hierarchy
Scientific consensus
Montreal experiments