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]
(1995-07-14)

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  • Ninety-ninth

    [nahyn-tee-nahynth] /ˈnaɪn tiˈnaɪnθ/ adjective 1. next after the ninety-eighth; being the ordinal number for 99. 2. being one of 99 equal parts. noun 3. a ninety-ninth part, especially of one (1/99). 4. the ninety-ninth member of a series.

  • Ninety-one

    [nahyn-tee-wuhn] /ˈnaɪn tiˈwʌn/ noun 1. a cardinal number, 90 plus 1. 2. a symbol for this number, as 91 or XCI. 3. a set of this many persons or things. adjective 4. amounting to 91 in number.



  • Ninety-second

    [nahyn-tee-sek-uh nd] /ˈnaɪn tiˈsɛk ənd/ adjective 1. next after the ninety-first; being the ordinal number for 92. 2. being one of 92 equal parts. noun 3. a ninety-second part, especially of one (1/92). 4. the ninety-second member of a series.

  • Ninety-seven

    [nahyn-tee-sev-uh n] /ˈnaɪn tiˈsɛv ən/ noun 1. a cardinal number, 90 plus 7. 2. a symbol for this number, as 97 or XCVII. 3. a set of this many persons or things. adjective 4. amounting to 97 in number.



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