OPEN SOURCE SOFTWARE: WHAT WE KNOW (AND DO NOT KNOW) ABOUT MOTIVATIONS TO CONTRIBUTE *

* We gratefully acknowledge the feedback from reviewers and participants at the DRUID Conference 2008, the University of Gothenburg research seminar, and the Open and User Innovation Workshop 2008 at Harvard Business School. The last three authors are to be considered joint second authors, with names reported in alphabetical order. The corresponding author is Sebastian Spaeth: sspaeth@ethz.ch or +41 44 632 8837.

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