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Ninety-Ninety Rule
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Ninety-Ninety Rule /n./ "The first 90% of the code accounts
for the first 90% of the development time. The remaining 10% of
the code accounts for the other 90% of the development time."
Attributed to Tom Cargill of Bell Labs, and popularized by Jon
Bentley's September 1985 "Bumper-Sticker Computer Science"
column in "Communications of the ACM". It was there called
the "Rule of Credibility", a name which seems not to have stuck.
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