I get an understanding of what good code is and what skills will be needed on my project. I can assess a software developer's skills and knowledge by looking at his code and asking technical questions. That's not always easy, but at least I know the way.
I get an understanding of what makes a good Project Manager. But how do I tell a good PM from a wannabe on the interview? I can not usually look at his/her projects. I can come up with some general questions like "What motivates people?". But that's not enough I guess.
What do I do to indicate a good Project Manager?