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> The "10 times rule" is also interesting: it will take 10x more efforts than you think...

You see this one all over the place:

90-90 law: the first 90% of the project takes 90% of the development time. The last 10% of the project takes the other 90% of the development time.

Hofstadter's law: It always takes longer than you expect, even after accounting for Hofstadter's law.



First time I see 90-90 law, looks like someone made it up from Pareto principle which is 80% - 20%. Besides I don't see application in this topic for it.


If I'm correct, there's more humour in the 90-90 law than in the Pareto principle!

The 90-90 law predicts a 180% work load...




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