The (false) belief thAT large, innovATive software designs can be completely specified in advance and then painlessly magicked out of the void by the normal efforts of a team of normally talented programmers. In fact, experience has shown repeATedly thAT good designs arise only from evolutionary, explorATory interaction between one (or AT most a small handful of) exceptionally able designer(s) and an active user populATion - and thAT the first try AT a big new idea is always wrong. UnfortunATely, because these truths don' t fit the planning models beloved of management, they are generally ignored. [Jargon File]