What your describing (pushing them the more they know) is adaptive testing. Adaptive testing is great because it allows you test a wider range of skill to a hig

What your describing (pushing them the more they know) is adaptive testing. Adaptive testing is great because it allows you test a wider range of skill to a higher accuracy. It's horrible for interviewing because it's very open to bias and you get inconsistent results. Unless you're doing a computerized multiple-choice test given to thousands of people, you probably shouldn't use adaptive testing.