First I want to understand what are the challenging issues. I will be able to do what is required first if the issues are defined and identified. Then, I will utilize my professional IT skills and business experience to resolve the issues. That's what I will do initially.
I believed that constant seemless communication was necessary to understand those expectations, even as they may evolve over time. (trick question - interviewer believed that it was more expected to fail than to succeed)
Some customers are so hard headed, what ever you do to satiesfy them they'll never understand.