I didn't think any of the questions were too difficult or unexpected. But, I was asked to be very detailed about my cost estimation experience, including walking them through a hypothetical Total Cost of Ownership estimate for acquiring and maintaining a fleet of vehicles from another government agency who no longer needed the assets. While it forced me to provide a very lengthy answer, I was glad they asked me this question for two reasons: first, it showed me that they are involved with and aware of the actual "grunt work" that takes place day-to-day on their projects (as opposed to the type of management who is really only top-level, hands off, and unaware of what's going on at the lower levels of their project teams) and two, it gave me the opportunity to showcase my skills and really impress them.
