Here is a presentation made by Martina Kauffeld-Monz (Institute for Urban Research and Structural Policy, IfS Berlin) made at the Net¹swork¹¹ International Conference on Professional Network Management on 24th November 2011 in Potsdam, entitled, Sources of Trust Building in Innovation Networks and the Contribution of Network Management. Further papers will appear on the Net¹swork¹¹ website.