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Gene Hall, of CBAM fame, provides a pretty clear description of Levels of Use and Innovation Configurations. It's usually more confusing, but this article presents a nice summary.

"NowComment makes it easy to have rich, engaging discussions of online documents no matter how large (or small) your class or collaboration group. NowComment is fast, powerful, and feature-rich: you can sort comments, skim summaries, create assignments, hide comments, reply privately, and much more"

This is a much better summary than the two second one I usually give people. :)

copy and paste text into a box and SMMRY summarizes it.