Definition of Megaproject

A megaproject is an extremely large scale investment project. Altshuler and Luberoff (2003) define megaprojects as "initiatives that are physical, very expensive, and public." On his website on megaprojects, Bent Flyvbjerg defines megaprojects as typically costing more than US$1 billion and attracting a lot of public attention because of substantial impacts on communities, environment, and budgets.