Well the whole story is in the book but the short answer is that I was the first information architect in an organization that was traditionally design-oriented and I felt I needed a tool to help me gain the trust and support of my colleagues.
You should trust any man in his own art provided he is skilled in it.
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There's good and bad everywhere in any aspect in life. The only people who we can't really trust are politicians. Because those guys lie to everybody and constantly.