A building, or edifice, is an enclosed
structure with a
roof
A roof ( : roofs or rooves) is the top covering of a building, including all materials and constructions necessary to support it on the walls of the building or on uprights, providing protection against rain, snow, sunlight, extremes of temp ...
and
wall
A wall is a structure and a surface that defines an area; carries a load; provides security, shelter, or soundproofing; or, is decorative. There are many kinds of walls, including:
* Walls in buildings that form a fundamental part of the su ...
s standing more or less permanently in one place, such as a
house
A house is a single-unit residential building. It may range in complexity from a rudimentary hut to a complex structure of wood, masonry, concrete or other material, outfitted with plumbing, electrical, and heating, ventilation, and air ...
or
factory
A factory, manufacturing plant or a production plant is an industrial facility, often a complex consisting of several buildings filled with machinery, where workers manufacture
Manufacturing is the creation or production of goods with t ...
(although there's also portable buildings).
Buildings come in a variety of sizes, shapes, and functions, and have been adapted throughout history for a wide number of factors, from
building material
Building material is material used for construction. Many naturally occurring substances, such as clay, rocks, sand, wood, and even twigs and leaves, have been used to construct buildings. Apart from naturally occurring materials, many man-mad ...
s available, to weather conditions, land prices, ground conditions, specific uses,
prestige, and aesthetic reasons. To better understand the term ''building'' compare the list of
nonbuilding structure
A nonbuilding structure, also referred to simply as a structure, refers to any body or system of connected parts used to support a load that was not designed for continuous human occupancy. The term is used by architects, structural eng ...
s.
Buildings serve several societal needs – primarily as shelter from weather, security, living space, privacy, to store belongings, and to comfortably live and work. A building as a shelter represents a physical division of the
human habitat (a place of comfort and safety) and the ''outside'' (a place that at times may be harsh and harmful).
Ever since the first
cave painting
In archaeology, Cave paintings are a type of parietal art (which category also includes petroglyphs, or engravings), found on the wall or ceilings of caves. The term usually implies prehistoric origin, and the oldest known are more than 40,00 ...
s, buildings have also become objects or canvasses of much artistic expression. In recent years, interest in
sustainable
Specific definitions of sustainability are difficult to agree on and have varied in the literature and over time. The concept of sustainability can be used to guide decisions at the global, national, and individual levels (e.g. sustainable livin ...
planning and building practices has also become an intentional part of the design process of many new buildings and other structures.
Definitions
The word ''building'' is both a noun and a verb: the structure itself and the act of making it. As a noun, a building is 'a structure that has a roof and walls and stands more or less permanently in one place';
"there was a three-storey building on the corner"; "it was an imposing edifice". In the broadest interpretation a
fence
A fence is a structure that encloses an area, typically outdoors, and is usually constructed from posts that are connected by boards, wire, rails or netting. A fence differs from a wall in not having a solid foundation along its whole length.
...
or wall is a building. However, the word ''structure'' is used more broadly than ''building'' including natural and man-made formations and does not necessarily have walls. Structure is more likely to be used for a fence.
Sturgis' Dictionary included that "
uildingdiffers from
architecture
Architecture is the art and technique of designing and building, as distinguished from the skills associated with construction. It is both the process and the product of sketching, conceiving, planning, designing, and constructing buildings ...
in excluding all idea of artistic treatment; and it differs from
construction
Construction is a general term meaning the art and science to form objects, systems, or organizations,"Construction" def. 1.a. 1.b. and 1.c. ''Oxford English Dictionary'' Second Edition on CD-ROM (v. 4.0) Oxford University Press 2009 and ...
in the idea of excluding scientific or highly skilful treatment." As a verb, building is the act of construction.
''Structural height'' in technical usage is the height to the highest architectural detail on building from street-level. Depending on how they are classified, spires and masts may or may not be included in this height. Spires and masts used as antennas are not generally included. The definition of a ''low-rise vs. a high-rise'' building is a matter of debate, but generally three stories or less is considered low-rise.
History
There is clear, evidence of homebuilding from around 18,000 BC. Buildings became common during the Neolithic (see
Neolithic architecture
The Neolithic period, or New Stone Age, is an Old World archaeological period and the final division of the Stone Age. It saw the Neolithic Revolution, a wide-ranging set of developments that appear to have arisen independently in several par ...
).
Types
Residential
Single-family residential buildings are most often called
house
A house is a single-unit residential building. It may range in complexity from a rudimentary hut to a complex structure of wood, masonry, concrete or other material, outfitted with plumbing, electrical, and heating, ventilation, and air ...
s or
home
A home, or domicile, is a space used as a permanent or semi-permanent residence for one or many humans, and sometimes various companion animals. It is a fully or semi sheltered space and can have both interior and exterior aspects to it ...
s. Multi-family residential buildings containing more than one dwelling unit are called a
duplex
Duplex (Latin, 'double') may refer to:
Arts and entertainment
* ''Duplex'' (film), or ''Our House'', a 2003 American black comedy film
* Duplex (band), a Dutch electronic music duo
* Duplex (Norwegian duo)
* Duplex!, a Canadian children's music ...
or an
apartment building. A
condominium
A condominium (or condo for short) is an ownership structure whereby a building is divided into several units that are each separately owned, surrounded by common areas that are jointly owned. The term can be applied to the building or complex ...
is an apartment that the occupant owns rather than rents. Houses may also be built in pairs (
semi-detached
A semi-detached house (often abbreviated to semi) is a single family duplex dwelling house that shares one common wall with the next house. The name distinguishes this style of house from detached houses, with no shared walls, and terraced hou ...
), in terraces where all but two of the houses have others either side; apartments may be built round courtyards or as rectangular blocks surrounded by a piece of ground of varying sizes. Houses which were built as a single dwelling may later be divided into apartments or
bedsitters; they may also be converted to another use e.g. an office or a shop.
hotel
A hotel is an establishment that provides paid lodging on a short-term basis. Facilities provided inside a hotel room may range from a modest-quality mattress in a small room to large suites with bigger, higher-quality beds, a dresser, a ref ...
s, especially of the extended stay variety (like
apartels) can also be classed as residential.
Building types may range from
huts to multimillion-dollar high-rise
apartment block
A tower block, high-rise, apartment tower, residential tower, apartment block, block of flats, or office tower is a tall building, as opposed to a low-rise building and is defined differently in terms of height depending on the jurisdicti ...
s able to house thousands of people. Increasing settlement density in buildings (and smaller distances between buildings) is usually a response to high ground prices resulting from many people wanting to live close to work or similar attractors. Other common
building material
Building material is material used for construction. Many naturally occurring substances, such as clay, rocks, sand, wood, and even twigs and leaves, have been used to construct buildings. Apart from naturally occurring materials, many man-mad ...
s are brick, concrete or combinations of either of these with stone.
Residential buildings have different names for their use depending if they are seasonal include
holiday cottage
A holiday cottage, holiday home, vacation home, or vacation property is accommodation used for holiday vacations, corporate travel, and temporary housing often for less than 30 days. Such properties are typically small homes, such as cottage ...
(vacation home) or
timeshare
A timeshare (sometimes called vacation ownership) is a property with a divided form of ownership or use rights. These properties are typically resort condominium units, in which multiple parties hold rights to use the property, and each owne ...
; size such as a
cottage
A cottage, during Feudalism in England, England's feudal period, was the holding by a cottager (known as a cotter or ''bordar'') of a small house with enough garden to feed a family and in return for the cottage, the cottager had to provide s ...
or
great house
A great house is a large house or mansion with luxurious appointments and great retinues of indoor and outdoor staff. The term is used mainly historically, especially of properties at the turn of the 20th century, i.e., the late Victorian or ...
; value such as a
shack
A shack (or, in some areas, shanty) is a type of small shelter or dwelling, often primitive or rudimentary in design and construction.
Unlike huts, shacks are constructed by hand using available materials; however, whereas huts are usually r ...
or
mansion
A mansion is a large dwelling house. The word itself derives through Old French from the Latin word ''mansio'' "dwelling", an abstract noun derived from the verb ''manere'' "to dwell". The English word '' manse'' originally defined a property l ...
; manner of construction such as a
log home
A log house, or log building, is a structure built with horizontal logs interlocked at the corners by notching. Logs may be round, squared or hewn to other shapes, either handcrafted or milled. The term "log cabin" generally refers to a sma ...
or
mobile home
A mobile home (also known as a house trailer, park home, trailer, or trailer home) is a prefabricated structure, built in a factory on a permanently attached chassis before being transported to site (either by being towed or on a trailer). Us ...
;, architectural style such as a mock
castle
A castle is a type of fortified structure built during the Middle Ages predominantly by the nobility or royalty and by military orders. Scholars debate the scope of the word ''castle'', but usually consider it to be the private fortified r ...
or
Victorian house
In Great Britain and former British colonies, a Victorian house generally means any house built during the reign of Queen Victoria. During the Industrial Revolution, successive housing booms resulted in the building of many millions of Victorian ...
, proximity to the ground or water such as
Earth sheltering the earth sheltered
Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surface ...
house,
stilt house
Stilt houses (also called pile dwellings or lake dwellings) are houses raised on stilts (or piles) over the surface of the soil or a body of water. Stilt houses are built primarily as a protection against flooding; they also keep out vermin. The ...
, or
houseboat
A houseboat is a boat that has been designed or modified to be used primarily as a home. Most houseboats are not motorized as they are usually moored or kept stationary at a fixed point, and often tethered to land to provide utilities. H ...
\ floating home. Also if the residents are in need of special care, or society considers them to dangerous to have
freedom, there's residential
total institution
A total institution is a place of work and residence where a great number of similarly situated people, cut off from the wider community for a considerable time, together lead an enclosed, formally administered round of life. Privacy is limited in ...
s such as
nursing home
A nursing home is a facility for the residential care of elderly or disabled people. Nursing homes may also be referred to as skilled nursing facility (SNF) or long-term care facilities. Often, these terms have slightly different meanings to i ...
s,
orphanage
An orphanage is a residential institution, total institution or group home, devoted to the care of orphans and children who, for various reasons, cannot be cared for by their biological families. The parents may be deceased, absent, or abu ...
s,
psychiatric hospital
Psychiatric hospitals, also known as mental health hospitals, behavioral health hospitals, are hospitals or wards specializing in the treatment of severe mental disorders, such as schizophrenia, bipolar disorder, eating disorders, dissociat ...
s or
prison
A prison, also known as a jail, gaol (dated, standard English, Australian, and historically in Canada), penitentiary (American English and Canadian English), detention center (or detention centre outside the US), correction center, correc ...
; or in group housing like
barracks
Barracks are usually a group of long buildings built to house military personnel or laborers. The English word originates from the 17th century via French and Italian from an old Spanish word "barraca" ("soldier's tent"), but today barracks are ...
or
dormitories
A dormitory (originated from the Latin word ''dormitorium'', often abbreviated to dorm) is a building primarily providing sleeping and residential quarters for large numbers of people such as boarding school, high school, college or university ...
.
Historically many people lived in communal buildings called
longhouse
A longhouse or long house is a type of long, proportionately narrow, single-room building for communal dwelling. It has been built in various parts of the world including Asia, Europe, and North America.
Many were built from timber and often rep ...
s, smaller dwellings called
pit-house
A pit-house (or ''pit house'', ''pithouse'') is a house built in the ground and used for shelter. Besides providing shelter from the most extreme of weather conditions, these structures may also be used to store food (just like a pantry, a larde ...
s and houses combined with barns sometimes called
housebarns.
Buildings are defined to be substantial, permanent structures so other dwelling forms such as
yurt
A yurt (from the Turkic languages) or ger ( Mongolian) is a portable, round tent covered and insulated with skins or felt and traditionally used as a dwelling by several distinct nomadic groups in the steppes and mountains of Central Asia ...
s, and
motorhome
A motorhome (or motor coach) is a type of self-propelled recreational vehicle (RV) which offers mobile living accommodation.
Features
Motorhomes usually have sleeping spaces for two to eight people. Each sleeping space is either fixed or conv ...
s are
dwelling
In law, a dwelling (also known as a residence or an abode) is a self-contained unit of accommodation used by one or more households as a home - such as a house, apartment, mobile home, houseboat, vehicle, or other "substantial" structure. T ...
s but not buildings.
Commercial
A commercial building is one in which at least one
business is based, but where people don't live. Examples include
stores,
restaurants, and
hotel
A hotel is an establishment that provides paid lodging on a short-term basis. Facilities provided inside a hotel room may range from a modest-quality mattress in a small room to large suites with bigger, higher-quality beds, a dresser, a ref ...
s.
Industrial
Industrial buildings are those in which
heavy industry
Heavy industry is an industry that involves one or more characteristics such as large and heavy products; large and heavy equipment and facilities (such as heavy equipment, large machine tools, huge buildings and large-scale infrastructure); ...
is done, such as
manufacturing
Manufacturing is the creation or production of goods with the help of equipment, labor, machines, tools, and chemical or biological processing or formulation. It is the essence of secondary sector of the economy. The term may refer to a ...
. These edifices include
warehouse
A warehouse is a building for storing goods. Warehouses are used by manufacturers, importers, exporters, wholesalers, transport businesses, customs, etc. They are usually large plain buildings in industrial parks on the outskirts of cities, ...
s and factories.
Agricultural
Agricultural buildings are the
outbuildings located on
farm
A farm (also called an agricultural holding) is an area of land that is devoted primarily to agricultural processes with the primary objective of producing food and other crops; it is the basic facility in food production. The name is used ...
s, like
barn
A barn is an agricultural building usually on farms and used for various purposes. In North America, a barn refers to structures that house livestock, including cattle and horses, as well as equipment and fodder, and often grain.Allen ...
s.
Mixed use
Some buildings incorporate several or multiple different uses, most commonly are those that combine commercial and residential uses.
Complex
Sometimes a group of inter-related (and possibly inter-connected) builds are referred to as a complex – for example a
housing complex
A housing estate (or sometimes housing complex or housing development) is a group of homes and other buildings built together as a single development. The exact form may vary from country to country.
Popular throughout the United States a ...
, educational complex, hospital complex, etc.
Creation
The practice of designing, constructing, and operating buildings is most usually a collective effort of different groups of
professional
A professional is a member of a profession or any person who works in a specified professional activity. The term also describes the standards of education and training that prepare members of the profession with the particular knowledge and ski ...
s and
trades. Depending on the size, complexity, and purpose of a particular building project, the project team may include:
* A
real estate developer who secures
funding
Funding is the act of providing resources to finance a need, program, or project. While this is usually in the form of money, it can also take the form of effort or time from an organization or company. Generally, this word is used when a firm us ...
for the project;
* One or more financial institutions or other investors that provide the funding
* Local planning and code authorities
* A
surveyor who performs an ALTA/ACSM and construction surveys throughout the project;
*
Construction managers who coordinate the effort of different groups of project participants;
* Licensed
architect
An architect is a person who plans, designs and oversees the construction of buildings. To practice architecture means to provide services in connection with the design of buildings and the space within the site surrounding the buildings that h ...
s and
engineers
Engineers, as practitioners of engineering, are professionals who Invention, invent, design, analyze, build and test machines, complex systems, structures, gadgets and materials to fulfill functional objectives and requirements while considerin ...
who provide
building design
Building design refers to the broadly based architectural, engineering and technical applications to the design of buildings. All building projects require the services of a building designer, typically a licensed architect. Smaller, less complica ...
and prepare construction
document
A document is a written, drawn, presented, or memorialized representation of thought, often the manifestation of non-fictional, as well as fictional, content. The word originates from the Latin ''Documentum'', which denotes a "teaching" o ...
s;
* The principal design Engineering disciplines which would normally include the following professionals:
Civil
Civil may refer to:
*Civic virtue, or civility
*Civil action, or lawsuit
* Civil affairs
*Civil and political rights
*Civil disobedience
*Civil engineering
*Civil (journalism), a platform for independent journalism
*Civilian, someone not a membe ...
, Structural, Mechanical building services or HVAC (heating Ventilation and Air Conditioning) Electrical Building Services, Plumbing and drainage. Also other possible design Engineer specialists may be involved such as Fire (prevention), Acoustic, façade engineers, building physics, Telecoms, AV (Audio Visual), BMS (Building Management Systems) Automatic controls etc. These design Engineers also prepare construction documents which are issued to specialist contractors to obtain a price for the works and to follow for the installations.
*
Landscape architect
A landscape architect is a person who is educated in the field of landscape architecture. The practice of landscape architecture includes: site analysis, site inventory, site planning, land planning, planting design, grading, storm water manageme ...
s;
*
Interior design
Interior design is the art and science of enhancing the interior of a building to achieve a healthier and more aesthetically pleasing environment for the people using the space. An interior designer is someone who plans, researches, coordin ...
ers;
* Other consultants;
*
Contractor
A contractor is a person or company that performs work on a contract basis. The term may refer to:
Business roles
* Defense contractor, arms industry which provides weapons or military goods to a government
* General contractor, an individual o ...
s who provide
construction
Construction is a general term meaning the art and science to form objects, systems, or organizations,"Construction" def. 1.a. 1.b. and 1.c. ''Oxford English Dictionary'' Second Edition on CD-ROM (v. 4.0) Oxford University Press 2009 and ...
services and install building systems such as
climate control
Heating, ventilation, and air conditioning (HVAC) is the use of various technologies to control the temperature, humidity, and purity of the air in an enclosed space. Its goal is to provide thermal comfort and acceptable indoor air quality. H ...
,
electrical
Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described ...
,
plumbing
Plumbing is any system that conveys fluids for a wide range of applications. Plumbing uses pipes, valves, plumbing fixtures, tanks, and other apparatuses to convey fluids. Heating and cooling (HVAC), waste removal, and potable water deliver ...
,
decoration,
fire protection
Fire protection is the study and practice of mitigating the unwanted effects of potentially destructive fires. It involves the study of the behaviour, compartmentalisation, suppression and investigation of fire and its related emergencies, as we ...
,
security" \n\n\nsecurity.txt is a proposed standard for websites' security information that is meant to allow security researchers to easily report security vulnerabilities. The standard prescribes a text file called \"security.txt\" in the well known locat ...
and
telecommunications
Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than tha ...
;
* Marketing or
leasing
A lease is a contractual arrangement calling for the user (referred to as the ''lessee'') to pay the owner (referred to as the ''lessor'') for the use of an asset. Property, buildings and vehicles are common assets that are leased. Industrial ...
agents;
*
Facility managers who are responsible for operating the building.
Regardless of their size or intended use, all buildings in the US must comply with
zoning ordinances,
building code
A building code (also building control or building regulations) is a set of rules that specify the standards for constructed objects such as buildings and non-building structures. Buildings must conform to the code to obtain planning permiss ...
s and other regulations such as
fire code
Fire safety is the set of practices intended to reduce the destruction caused by fire. Fire safety measures include those that are intended to prevent the ignition of an uncontrolled fire and those that are used to limit the development and ef ...
s,
life safety codes and related standards.
Vehicles—such as
trailers
Trailer may refer to: a
Transportation
* Trailer (vehicle), an unpowered vehicle pulled by a powered vehicle
** Bicycle trailer, a wheeled frame for hitching to a bicycle to tow cargo or passengers
** Full-trailer
** Semi-trailer
** Horse trai ...
,
caravans,
ship
A ship is a large watercraft that travels the world's oceans and other sufficiently deep waterways, carrying cargo or passengers, or in support of specialized missions, such as defense, research, and fishing. Ships are generally distinguishe ...
s and passenger
aircraft
An aircraft is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines. ...
—are treated as "buildings" for life safety purposes.
Ownership and funding
*
Mortgage loan
A mortgage loan or simply mortgage (), in civil law jurisdicions known also as a hypothec loan, is a loan used either by purchasers of real property to raise funds to buy real estate, or by existing property owners to raise funds for any p ...
*
Real estate developer
Building services
Physical plant
Any building requires a certain general amount of internal infrastructure to function, which includes such elements like heating / cooling, power and telecommunications, water and wastewater etc. Especially in
commercial building
Commercial may refer to:
* a dose of advertising conveyed through media (such as - for example - radio or television)
** Radio advertisement
** Television advertisement
* (adjective for:) commerce, a system of voluntary exchange of products and ...
s (such as offices or factories), these can be extremely intricate systems taking up large amounts of space (sometimes located in separate areas or double floors / false ceilings) and constitute a big part of the regular maintenance required.
Conveying systems
Systems for
transport
Transport (in British English), or transportation (in American English), is the intentional movement of humans, animals, and goods from one location to another. Modes of transport include air, land ( rail and road), water, cable, pipel ...
of people within buildings:
*
Elevator
An elevator or lift is a cable-assisted, hydraulic cylinder-assisted, or roller-track assisted machine that vertically transports people or freight between floors, levels, or decks of a building, vessel, or other structure. They ar ...
*
Escalator
An escalator is a moving staircase which carries people between floors of a building or structure. It consists of a motor-driven chain of individually linked steps on a track which cycle on a pair of tracks which keep the step tread horiz ...
*
Moving sidewalk (horizontal and inclined)
Systems for transport of people between interconnected buildings:
*
Skyway
A skyway, skybridge, skywalk, or sky walkway is an elevated type of pedway connecting two or more buildings in an urban area, or connecting elevated points within mountainous recreational zones. Urban skyways very often take the form of encl ...
*
Underground city
An underground city is a series of linked subterranean spaces that may provide a defensive refuge; a place for living, working or shopping; a transit system; mausolea; wine or storage cellars; cisterns or drainage channels; or several of th ...
Building damage
Buildings may be damaged during the construction of the building or during maintenance. There are several other reasons behind building damage like accidents such as storms, explosions, subsidence caused by mining, water withdrawal or poor foundations and landslides. Buildings also may suffer from
fire damage and flooding in special circumstances. They may also become dilapidated through lack of proper maintenance or alteration work improperly carried out.
Hypothetical future buildings
Advances in construction technology, ideologies, etc may allow (or necessitate) the construction of new kinds of buildings and complexes, like an
arcology
Arcology, a portmanteau of "architecture" and "ecology",. is a field of creating architectural design principles for very densely populated and ecologically low-impact human habitats.
The term was coined in 1969 by architect Paolo Soleri, who be ...
.
See also
*
Autonomous building
An autonomous building is a building designed to be operated independently from infrastructural support services such as the electric power grid, gas grid, municipal water systems, sewage treatment systems, storm drains, communication services ...
*
Commercial modular construction
*
Earthquake engineering
Earthquake engineering is an interdisciplinary branch of engineering that designs and analyzes structures, such as buildings and bridges, with earthquakes in mind. Its overall goal is to make such structures more resistant to earthquakes. An earth ...
*
Float glass
Float glass is a sheet of glass made by floating molten glass on a bed of molten metal, typically tin, although lead and other various low-melting-point alloys were used in the past. This method gives the sheet uniform thickness and very flat sur ...
*
Green building
Green building (also known as green construction or sustainable building) refers to both a structure and the application of processes that are environmentally responsible and resource-efficient throughout a building's life-cycle: from planni ...
*
Hurricane-proof building
*
List of buildings and structures
*
List of largest buildings in the world
*
List of tallest buildings in the world
This list of tallest buildings includes skyscrapers with continuously occupiable floors and a height of at least . Nonbuilding structure, Non-building structures, such as towers, are not included in this list (for these, see ''List of tallest ...
*
Natural building
A natural building involves a range of building systems and materials that place major emphasis on sustainability. Ways of achieving sustainability through natural building focus on durability and the use of minimally processed, plentiful or renew ...
*
Natural disaster and
earthquake
An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from ...
*
Skyscraper
A skyscraper is a tall continuously habitable building having multiple floors. Modern sources currently define skyscrapers as being at least or in height, though there is no universally accepted definition. Skyscrapers are very tall high-ri ...
*
Steel building
A steel building is a metal structure fabricated with steel for the internal support and for exterior cladding, as opposed to steel framed buildings which generally use other materials for floors, walls, and external envelope. Steel buildings ...
*
Tent
A tent () is a shelter consisting of sheets of fabric or other material draped over, attached to a frame of poles or a supporting rope. While smaller tents may be free-standing or attached to the ground, large tents are usually anchored using ...
References
External links
*
*
*
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