I firmly believe that the only good proxy for how well one can do the job is doing the job. Even if there are good proxies for doing the work, why would you choose to use a proxy when you can just do the work? And if you're work is some complicated that you can't break off some piece of it and do it in an interview, maybe you're making stuff too hard for no particular reason.

Let's say you need someone who can lift 10 kilograms:

- Good interview: "Please lift this 10 kilogram bucket by the handle."

- Not Good interview: "As a proxy for your overall strength, please take off your pants, squat, pick up this 1 kg bucket by clenching the handle with your butt cheeks, and then stand. We know this isn't a real test of your strength, but we want to see how you perform under pressure."

EDIT: what I mean by doing the job, I mean test the skills used on the job. See if a chef knows their way around a kitchen & actually cook something. See if a customer support rep has good written & verbal communication skills in a mock support interaction. See if a phone screening can do phone screens. Stuff like that.