Much of present-day software acquisition procedure rests upon the assumption that one can specify a satisfactory system in advance, get bids for its construction, have it built, and install it. I think this assumption is fundamentally wrong, and that many software acquisition problems spring from that fallacy. (Brooks 1987 cited Larman and Basili 2003, p.52).
Source: http://www.sebastiangreger.net/writings/concept-design-in-agile-environment/
