I was surprised to find that, in this leadership interview with VMWare CEO Paul Maritz, he cites "self-awareness" as a key quality when hiring employees. He shares that his favorite question to ask in an interview is, taking a project they've done in the past, "Thinking about it now, what would you have done differently? What did you learn from that?" If the answer ends with a lot of blame placed on someone else, for example, you can conclude that the person didn't learn much from the project and that they're not very self-aware.