A social dilemma is a game which at first glance has only inefficient solutions. Which changes in the social context of a social dilemma situation are necessary in order for players to rationally choose the cooperative option? How do real players actually behave in social dilemma situations?

Contributions by: W. Albers, D.V. Budescu, A. Crettenden, A. Diekmann, T. Doi, I. Erev, I. Eshel, M. Foddy, A. Franzen, R. Gardner, W. Güth, N. Hayashi, N. Jin, D.M. Kuhlmann, B. Latane, M. Lewenstein, W.B.G. Liebrand, R.M. Meertens, D.M. Messick, H.C. Micko, A. Nowack, H. Okuda, A. Ostmann, E. Ostrom, A. Rapoport, K. Ritzberger, E. Sansone, R. Suleiman, N. Takahashi, T. Takigawa, E. Van Dijk, P.A.M. Van Lange, M. Van Vugt, R. Vollmeyer, J. Walker, M. Watabe, D. Weinshall, H. Wilke, T. Yamagishi