The editors are collaborators at the Groningen Center for Social Complexity Studies (GCSCS) and organised the Social Simulation Conference 2015 in Groningen, The Netherlands. The GCSCS serves as a platform connecting researchers at or affiliated with the University of Groningen working in the field of social complexity. The aim of the GCSCS is to provide high quality research and education, interacting actively with business, government and the public, and in particular to address the goal of stimulating cross-border research and education.