In the reading it talked about natural and instructional settings. We've talked in many of my classes about the need to be as natural as possible in the lessons we present. In the chapter I noticed that a natural setting doesn't have direct instruction of the L2. I would think this would be really difficult to learn. I like to have direct instruction to get the basics. I would expect there would be many things that are too complex to understand that way. I think the repetition in a class dedicated to language learning is essential.