Infrastructure, most generally, is a set of interconnected structural elements that provide the framework supporting an entire structure. The term has diverse meanings in different fields, but is perhaps most widely understood to refer to roads, sewers, and the like, the infrastructure of a city or region. These various elements may collectively be termed civil infrastructure, municipal infrastructure, or simply public works, although they may be developed and operated as private-sector or government enterprises. In other applications, infrastructure may refer to information technology, informal and formal channels of communication, software development tools, political and social networks, or shared beliefs held by members of particular groups. Still underlying these more general uses is the concept that infrastructure provides organizing structure and support for the system or organization it serves, whether it is a city, a nation, or a corporation.

The word seems to have originated in 19th Century France, and throughout the first half of the 20th Century was used to refer primarily to military installations. The term came to prominence in the United States in the 1980s following publication of America in Ruins (Choate and Walter, 1981), which initiated a public-policy discussion of the nation’s “infrastructure crisis,” purported to be caused by decades of inadequate investment and poor maintenance of public works.

That public-policy discussion was hampered by lack of a precise definition for infrastructure. A U. S. National Research Council (NRC) committee cited Senator Stafford, who commented at hearings before the Subcommittee on Water Resources, Transportation, and Infrastructure; Committee on Environment and Public Works; that “probably the word infrastructure means different things to different people." The NRC panel then sought to rectify the situation by adopting the term "public works infrastructure," referring to "...both specific functional modes--highways, streets, roads, and bridges; mass transit; airports and airways; water supply and water resources; wastewater management; solid-waste treatment and disposal; electric power generation and transmission; telecommunications; and hazardous waste management--and the combined system these modal elements comprise. A comprehension of infrastructure spans not only these public works facilities, but also the operating procedures, management practices, and development policies that interact together with societal demand and the physical world to facilitate the transport of people and goods, provision of water for drinking and a variety of other uses, safe disposal of society's waste products, provision of energy where it is needed, and transmission of information within and between communities." (Infrastructure for the 21st Century, Washington, DC: National Academy Press, 1987)

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