This is a great analogy on why it's so difficult to estimate: https://www.quora.com/Engineering-Management/Why-are-software-development-task-estimations-regular

This is a great analogy on why it's so difficult to estimate: https://www.quora.com/Engineering-Management/Why-are-software-development-task-estimations-regularly-off-by-a-factor-of-2-3/answer/Michael-Wolfe https://www.quora.com/Engineering-Management/Why-are-softwar... Estimating should be fun, plus there are various ways, such as estimating as a team (majority wins), t-shirt sizes, etc