Why software projects take longer than you think – a statistical model

1 · Erik Bernhardsson · April 15, 2019, 4 a.m.
Anyone who built software for a while knows that estimating how long something is going to take is hard. It’s hard to come up with an unbiased estimate of how long something will take, when fundamentally the work in itself is about solving something. One pet theory I’ve had for a really long time, is that some of this is really just a statistical artifact. I suspect devs are actually decent at estimating the *median* time to complete a task. Planning is hard because they suck at the *average*.— ...