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OpenSym is a shorthand for International Symposium on Open Collaboration, formerly International Symposium on Wikis and Open Collaboration, also formerly WikiSym or the Wiki Symposium, a conference dedicated to wiki research and practice. In 2014, the name of the conference was changed from WikiSym to OpenSym to reflect a broadening of scope from wiki and Wikipedia research and practice to open collaboration research, including wikis and Wikipedia research, but also free/libre/open source, open data, etc. research. Its proceedings are published in the ACM Digital Library.

WikiSym 2005 was co-located with ACM OOPSLA 2005, held in San Diego, California, US, 1416 October 2005. Speakers included Ward Cunningham, Jimmy Wales, Ross Mayfield and Sunir Shah. Sponsors of the event included Google. Conference chair was Dirk Riehle.

WikiSym 2006 was co-located with ACM Hypertext 2006 from 2123 August 2006 in Odense, Denmark. Invited speakers included Angela Beesley ("How and Why Wikipedia Works"), Doug Engelbart and Eugene Eric Kim ("The Augmented Wiki"), Mark Bernstein ("Intimate Information: organic hypertext structure and incremental formalization for everyone's everyday tasks"), and Ward Cunningham ("Design Principles of Wiki: How can so little do so much?"). Conference chair was Dirk Riehle and program chair was James Noble.

WikiSym 2008 was held in Porto, Portugal, in 810 September 2008, at the Faculty of Engineering of the University of Porto and supported ("in-cooperation agreement") by the ACM. Keynotes were given by George Landow, Professor of Art and English at Brown University, and Stewart Nickolas, IBM Emerging Technologies while Dan Ingalls, Sun Microsystems Laboratories gave an invited talk. The symposium chair was Ademar Aguiar and the program chair was Mark Bernstein.

WikiSym 2011 was held in Mountain View on 35 October 2011. Keynote speakers were Cathy Casserly, CEO of Creative Commons, Jeff Heer, assistant professor from Stanford University, and Ed Chi of Google. The symposium chair was J. Felipe Ortega and the program chair was Andrea Forte.

OpenSym 2015, the 11th International Symposium on Open Collaboration, was held in San Francisco on August 1921, 2015. Research submissions revolved around IT-driven open innovation, open data, free/libre/open source software etc. Academic keynotes were taken by Robert J. Glushko of UC Berkeley and Anthony I. Wasserman of CMU (Silicon Valley). Industry (research) keynotes were taken by Richard P. Gabriel of IBM and Peter Norvig of Google.

OpenSym 2016, the 12th International Symposium on Open Collaboration, took place in Berlin, Germany on August 1719, 2016. Anthony I. (Tony) Wasserman served as general chair. Keynote speakers were Adam Blum, Luis Falcon Martin, Leslie Hawthorn, Bradley M. Kuhn, and Ina Schieferdecker.