I do have some students in my class that are inattentive, using their cell phones,ipads, computers or doodling. And, as you stated, i do walk toward them and immediately they put their devices down. In addition, I have had some "Center-Staged Sudents". I love both your ideas about asking them to be "observers" and taking notes. But my favorite idea is "Using it Wisely. I think it gvies the students reponsibity in adding good conversation about the topic.
