Yuriy's presentation on wikis reminded me of a visualization from IBM's Collaborative User Experience Research group called History Flow. This visualization shows how the many different authors of a wiki page collaborate. An example from Discover Magazine demonstrates how the visualization can be used to study the history of an article. I think this is a really interesting way to look at collaboration.More examples can be found here. The images are most dramatic for articles that are somewhat controversial or prone to vandalism because these articles have a high number of edits and lots of deletions and reversions.
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