There is not always an interview. It depends largely on whether there is any type of concern.
With regard to parents, sometimes it's not an interview per se; it's more to see whether all the information is entered correctly or not. In the case of China, with which I'm more familiar, we would spend, let's say, the morning with a group of parents reviewing all the applications and making sure all the paperwork is fine. It's not an interview per se, but it's an opportunity to provide information.