Regardless of the beliefs of corporate managers about the importance of interviews in the selection process, interview performance is useless as an indicator of actual job performance. There are hundreds of studies that verify this. Organizational psychologists recommend the use of valid job selection procedures in the place of interviews, but the evidence is more or less ignored. If a corporation's goal is to make money, you would think their perspective would be "let's use the most valid job selection procedures possible to obtain excellent employees and increase profitability". Strangely, that's not what's going on.
>
> Personally, I advise businesses to maybe offer a puzzle to candidates
> applying for a programming position. Nothing stressful; email them
> some (time-respecting, relatively simple) programming puzzles and ask
> them to maybe solve one of them. (After all, would you hire a juggler
> without seeing them juggle?)
Sure, you're on the same page as the organizational psychologists: give people relevant work samples, assess their performance on the kind of work they'll be doing in the job. That sort of assessment is a far, far more valid predictor of job performance than an interview is.
Miles