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History Flow Visualization of the Wikipedia Entry on “Abortion”, by Martin Wattenberg and Fernanda B. Viégas Dr. Martin Wattenberg at IBM Watson Research Center in Cambridge, Massachusetts, and Dr. Fernanda B. Viégas, formerly with MIT Media Laboratory and now at IBM, designed the History Flow visualization technique. History Flow helps reveal complex records of contributions and collaboration. Among other uses, it can be applied to show the evolution of documents, e.g., Wikipedia entries created by people all over the world. The map shows the edit history of the Wikipedia entry on "Abortion." A list of color-coded contributing authors of this entry is given on the left. The graph in the middle shows the History Flow visualization where each version of the entry is represented by a vertical line, sorted in time, from left to right. Text contributed by a specific author is represented as color coded, horizontal band. Bands are thickness coded by the length of the text contributed to a specific version. The right column shows the entry as of April 20th, 2003 at 5:32pm, color-coded according to the author of the final edit. As can be seen, the page has been edited by many different authors and it survived several complete deletions