Definitions for ninety-ninety rule
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In computer programming and software engineering, the ninety-ninety rule is a humorous aphorism that states: That the total development time sums to 180% is a wry allusion to the notorious tendency of software development projects to significantly overrun their original schedules. 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. In other words, it takes both more time and more coding than expected to make a project work. The rule is attributed to Tom Cargill of Bell Labs and was made popular by Jon Bentley's September 1985 "Programming Pearls" column in Communications of the ACM, in which it was titled the "Rule of Credibility".
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"ninety-ninety rule." Definitions.net. STANDS4 LLC, 2015. Web. 27 Jul 2015. <http://www.definitions.net/definition/ninety-ninety rule>.