They use the START model, so if you're not familiar I highly recommend you brush up on it. Your answers are scored from 1-5 and you will be asked 5 questions. You won't know your score/they won't tell it to you, so you just need to make sure you're covering all the points in the START model. They're more concerned with your behaviors and thought process so be certain to talk through the "why" behind what you did in your interview answers.