= Ninety–ninety rule
{wiki=Ninety–ninety_rule}
The Ninety-Ninety Rule is a humorous adage in software development and project management that suggests that "the first 90% of a project takes 90% of the time, and the last 10% takes another 90% of the time." This saying highlights the common phenomenon where initial stages of a project may seem to progress quickly, but the final stages often take significantly longer due to unforeseen challenges, complexities, or the need for refinements and testing.
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