A very clever article on software estimation, "Always Multiply Your Estimates by π" at #AltDevBlog.
"Now some may question my mathematical rigour, and even dispute what I believe to be the incontrovertible conclusion. People may claim that the correct multiplier is not in fact π — but that it is rather 2, or √2, or e, or the golden ratio φ. I am, however, aware of no one who claims the multiplier is less than one."
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