The Third World Congress on Social Simulation was held in Kassel, Germany on 6-9 September 2010. It was jointly organised by PAAA (Pacific and Asia), NAACSOS (North America) and ESSA (Europe). Invited speakers were Marco Janssen (Arizona State University, USA), Wolfram Mauser (Ludwig-Maximilians University, Germany) and Shingo Takahashi (Waseda University, Japan).