The principles behind the Manifesto for Agile Software Development mention only retrospectives, not estimates. You could say they value learning over guessing.
When people ask me how can they learn, I tell them to find old project schedules and other project documents. Looking at past projects makes the learning more objective, and it is not happening under time pressure.
When people ask me how can they learn, I tell them to find old project schedules and other project documents. Looking at past projects makes the learning more objective, and it is not happening under time pressure.