http://www.opensym.org/about-us/definition/">Definition of Open Collaboration

OpenSym (formerly WikiSym) is the premier research and practitioner conference on open collaboration.

Open collaboration is collaboration that is

Prime places to find open collaboration are wikis, Wikipedia and other Wikimedia Foundation projects, open source projects, open data and open government initiatives, open educational resources, and so on.

The open collaboration definition was agreed-upon by the WikiSym steering committee in 2012 (after adding “open collaboration” to the conference title in 2009).