B. Scott Anderson writes in The Myth of External Program Documentation:
Weinberg asked the audience who among them had ever participated in a feasibility study where the answer came back “No”. Not a single hand of the 1,500 in attendance was raised. Which begs the question “how many of these documents are good science and how many are simply position papers.
I like his comment about how XP practitioners are at least honest in the fact that they don’t produce the stereotypical bits of documentation artifacts (whereas everyone else deludes themselves into thinking they are producing useful documentation artifacts).