It was only a telephone interview. The interview was through an agent. It was a casual discussion and they asked me a lot of details about my background and a couple of assignment I have done during my studies. They asked me to choose two of them and talk about them briefly. The lady I was talking to was really friendly and did not make you uncomfortable at all. I did not pass this stage cause of my luck of experience. Though, they mentioned that the next stage is to send you a raw dataset, you do some analysis and present your results to them face to face, like a presentation.