I just had a client ask for some clarifying information regarding non-technical controls. It seems that the documentation did not fully enumerate those results. In order to ensure I have that information before leaving the client site, I will ensure the clients have the interview questions before I arrive. I believe it will allow the interview to run quicker in that the client will already know the questions. Also, if they've filled out answers, I'll have a hard copy I can take back to accompany what I've documented myself.
I'll see how this goes shortly, as my next testing engagement is scheduled for a couple of weeks.