In our team we have found a tendency for the time spent estimating stories to creep upward. More and more design seems to be considered as we work through the stories. While this is a very valuable way of sharing information among the team, it is not a very effective way of estimating.
Akshay Dhavle has written a brief blog post reminding that sometimes, all that is needed is a simple “small, mediun or large” estimate. Business Analysis: Can’t negotiate size… and a good thing too