Engineering News Record is a weekly magazine widely known as ENR. It provides data, opinion and analysis about the construction industry. The subscribers of this magazine are engineers, contractors, architects and public works officials. This magazine covers the design and construction of high rise buildings and irrigation structures like dams, tunnels, water and waste water projects and other structures like stadium, airport, long-span bridges power plants, industrial plants, toxic waste cleanup projects. Hence we can say that, these 400 companies are responsible for the majority of construction works.