FLOSS POLS
FLOSS-POLS, a EU-funded research project,
claims it is "the single largest knowledge base on open source usage and development worldwide" and its 'third track' examines " the efficiency of open source as a system for collaborative problem-solving", see at http://www.flosspols.org/ . The peer-reviewed journal First Monday dedicated a special issue to 'open source as a social process', at http://www.firstmonday.org/issues/issue9_11/index.html