The taxonomy is about what you would expect, ranging from Level 0 (talking head) to Level 6 (open-ended activities). But I find it limited - it only postulates one track. Even in my conference talks, I have more than one track: me, the talking head, along with the very open-ended back-channel. Now, of course, there can be interplay between the talking head and the back-channel. In think interactivity is more complex than something that can be simply graded with a single-dimensional set of levels.
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