Ninety-Ninety Rule
<humour> "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".
An aphorism attributed to Tom Cargill of Bell Labs, and popularised 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.
[
Jargon File]
