Getting access to these business metrics requires engaging business people and typically their finance staff, too. Harder to do, but it’s time well spent. Consider conducting an interview where a business person highlights their key requirements, which are dutifully documented. They rant about a particular process or system that is broken, and now is the time (during the first weeks of the project) to ask how much it is costing them and to ask them for supporting data. Inform them right away that your ability to help them automate is dependent upon the financial data they provide.