The book mentioned in this article, 'Software Estimation: Demystifying the Black Art', actually goes into a lot of depth about this. For example, what is statis

The book mentioned in this article, 'Software Estimation: Demystifying the Black Art', actually goes into a lot of depth about this. For example, what is statistically likely to happen if you only use single point estimates when they are aggregated together, and how to correctly handle range estimates.