I like the video and the dimensions, they actually are an interesting instrument to describe teaching. I wonder whether there are similar dimensions to describe learning. Maybe the same set can be used in a shaped way as in informal learning teaching and learning is somehow a joint activity anyway. An interesting chapter in this context is one about the activity theory and how learning settings can be considered activity systems for student centered learning (Jonassen, 2000, in Jonassen & Land, Theoretical foundations of learning environments, pp.89-121). I am still in the thinking process and would welcome a discussion about it but I might feel quite comfortable abut starting to see learning as a kind of activity system.