This is a chance for the candidate to sell themselves, as well as to point out the attributes they want you to know about. For those that offer “non-answers” (e.g. I’m qualified, I can do the job, etc.) you may choose to probe…or accept the fact that this candidate really does not stand out. For the those who deliver bold statements, guarantees, or commitments, challenge them on each response with “Why?”. As an interviewer you could use help every now and then determining how to rank those you are considering. This is as straightforward a way as there is.