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90-90 Rule
In computer programming and software engineering, the ninety-ninety rule states:
- "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."
The rule is attributed to Tom Cargill of Bell Labs, and was made popular by J. Bentley's September 1985 "Bumper-Sticker Computer Science" column in Communications of the ACM.
It expresses both the rough allocation of time to easy and hard portions of a programming project and the cause of the lateness of many projects (that is, failure to anticipate the hard parts).
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