Unstructured interviews provide low reliability and low validity in predicting job performance and therefore greatly diminishing the likelihood of the right candidates being selected.

Why are unstructured interviews unreliable?

The main theoretical disadvantage is the lack of reliability – unstructured Interviews lack reliability because each interview is unique – a variety of different questions are asked and phrased in a variety of different ways to different respondents.

Are unstructured interviews valid?

An unstructured interview is one without any pre-planned questions. ... An advantage of these interviews is that they produce qualitative data that is thought to offer verstehen and be high in validity.