How do you estimate a project before it has really started. You have a great idea and want to present it to your CEO. The second question will be how much is this going to cost? You have spent a couple of hours with the customer and they want to know: “Can you do this by the hard deadline we have?” Comparative (story point) estimating works well if you have broken the work down into stories. It is more difficult if the epics are very big and there are a lot of unknowns.