Assuming you have been tasked with maintaining the cone of uncertainty for a prolonged project. The team is committed to provide re-estimation at 5 predefined points of the whole project life cycle. You are currently at point 4 and just received new re-estimation data. Is it enough for you to simply add new data and extend the curve? Or you have to re-calculate the previous three points and to re-draw the complete curve from the beginning? Extend Redraw complete curve