This is a good strategy and it's one I've employed, but what I've found a lot of the time is that you get nothing from the candidate.

Basically you ask them questions and they give you short, often vague answers. They don't really go into detail or talk at length.

I've found this about a lot of people in general. You can ask them three questions and they will sorta answer one, but never illuminate anything.

I don't know if this is a sign of dim intelligence, or nervousness or not paying attention or what.

But people who are on the ball and great communicators will do much better in this kind of interview than people who are terribly shy-- even though the latter might be a better employee. (spending less time around the water cooler for one.)