> Which is almost always known at the time of estimation, in my experience. In mine - not so much. Two dev team? Sure, you probably know. 6 dev team? Not so mu

> Which is almost always known at the time of estimation, in my experience. In mine - not so much. Two dev team? Sure, you probably know. 6 dev team? Not so much. Estimation, then back to customer to decide if they'll eat the cost and decision 2 weeks later? Good luck knowing what will happen then. Point is answering question "does it fit into the sprint", knowing that usually you can fit 3 big tasks and 3-5 small. Then real time estimate is end of sprint.