It is a dream situation, an abstraction too simplistic and dangerously optimistic. In all projects I've been the project takes "one more month to finish" for th

It is a dream situation, an abstraction too simplistic and dangerously optimistic. In all projects I've been the project takes "one more month to finish" for the next 15 months. The cone metaphor simply ignores all unknown unknowns. For a more deep criticism check "The Leprechauns of Software Engineering": https://leanpub.com/leprechauns/read_sample https://leanpub.com/leprechauns/read_sample