What tools are available to aid in cost estimating? How do you account for changing costs? How do you communicate the possibility of a cost overrun to your boss? Feel free to expand the context of the search beyond the points I list above. These are just starting points for the discussion. Pick one to start the discussion off, don't feel that you have to answer all three. As always, please include external sources in our discussion. What are the considerations for deciding whether a project is financially viable?