The first advantage is that students can choose the thing they want to practise or to learn. Secondly they can get immediate feedback, individual feedback, from the machine on whether they are making progress or not. And they can give up when they are tired or carry on if they're not tired. They don't have to depend on the rest of the class or the rest of the group. It's very advantageous. But I think most forms of teaching and most forms of learning are not possible by computer. I think the computer provides a lot of information when you want it. But it doesn't provide the essential feature in language learning, I think, and that is the practice of speaking to another human being or human beings. It's just an extra device, that's all. It's not intended to replace teachers and I don't think it will replace teachers.