This sounds like a great technique. It also gives both sides the chance to talk a problem through, bounce ideas off of one another, and see if there are any interesting insights to be had on the other side of the table.
A candidate and interviewer both have to be fairly relaxed and comfortable to do it properly, but that's more of a problem for people new to the interviewing process (probably not senior management roles)
It also gives both sides the chance to talk a problem through, bounce ideas off of one another, and see if there are any interesting insights to be had on the other side of the table.
Some companies do this intentionally without hiring anybody in order to double-check their plans. It's basically free consulting.
A candidate and interviewer both have to be fairly relaxed and comfortable to do it properly, but that's more of a problem for people new to the interviewing process (probably not senior management roles)