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Why is software effort estimation still based on thumb rules and gut feels? How come no one has come up with an accurate estimation model?

13th October 2010

My answer to Why is software effort estimation still based on thumb rules and gut feels? How come no one has come up with an accurate estimation model? on Quora

For a truly accurate estimation, you need to have built the software before. If you’ve built it before, why are you building it again?