In designing buildings it is necessary to understand that different people will use space in different ways. The ability to use a building may be influenced by a mis-understanding or lack of consideration of some people's needs. Trying to deign for every eventuality however would not be possible. Therefore designers must aim to include as many people as possible to use safely and independently their premises avoiding unnecessary restrictions. In an ageing population this can be expected to rise over the coming years as visual impairment has a strong correlation to age.
Some people have a combination of the above.
It is easier to form a mental picture of an environment if it is simple and logical in its layout. This picture can be retained and used as a mobility aid by visually impaired and deafblind people but also aids all users understand a building and where to expect services. If logical the first time user of a building should be able to predict where facilities will be, for example that the Gentleman's toilet will be located near to the Ladies. Common problems in layouts are confusing corridors, obstructions in circulation routes, such as columns and fire extinguishers or hazards such as the underside of staircases which people can walk into. Decorative finish Interior design and decorative finish add warmth and character to a building.