"The Errors of Estimation" by Vasco Duarte from his blog at http://softwaredevelopmenttoday.com

In this episode we find out why Vasco sees estimation as a failure point in agile development projects. We look at a number of different estimation approaches and explore their flaws. 

Vasco is a big advocate of the alternative 'No Estimates' approach to agile software development. If you'd like to learn more about this approach then Vascos book, 'No Estimates' and accompanying videos, are a great place to start. You'll find more information at https://oikosofyseries.com/no-estimates-book-order