write an example how to do something: how you define what modifier to use, write an example of polymorphism … Check experience, not theoretical knowledge. Notes: My personal experience says that we need to start communication with the task. First of all, it might look odd, but a lot of candidates start to feel better and more comfortable after the task, they focused on the problem but not on the dialogue, self-positioning and other aspects of interview which are out of their comfort zone, while they were solving the task. Second, some part of candidates, as to make conclusions from my personal experience, especially from India, do not pass that qualifying round, and you don’t spend your time on them. And there is no need for you to tell them why they were not accepted, because there are candidates which wait for the answer patiently and you can formulate the answer in a non-correct way due to not the best knowledge of English or any cultural features. But not solved task relieve from any kind of questions, and you only speak about the company, ask questions and say goodbye to the candidate.