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90–90 Rule

The first 90 percent of the code accounts for the first 90 percent of the development time. The remaining 10 percent of the code accounts for the other 90 percent of the development time.

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A wry reinterpretation of the Pareto Principe (or 80-20 rule) that highlights the real-world challenges of completing engineering work. This sentiment is also echoed in Hofstadter's Law.

What it means​

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Where it came from​

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What it looks like in practice​

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What changes with AI​

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The key takeaways​

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Summary​

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