Ronald L. Mace, an architect coined  this term in 1985. It is an environment that allows all people equal access, regardless of their level of mobility or disability. Accessibility must be incorporated into building design. Developers are not sensitised to this concept. Anyone can be subjected to a circumstance where accessibility is required, e.g. an accident, temporary disability, permanent disability, age-related issue. At times, we have to sacrifice space to make this happen. How a person enters a building?  How he navigates the different levels or use common facilities? To negotiate levels, we must have ramps. The tactile surface on which people walk should also be considered. The door knobs, light switches, lift panels must be within reach. A friendly wheel chair or a car or a stick with GPS — all this must be designed properly. Velcro and Google electric truth brushes are examples of universal design.