 A related recent trend in game theory that is relevant for social software, is to step away from solution concepts such as the Nash equilibrium and instead to focus on the process of rational deliberation: the “theory of play” (see van Benthem, Pacuit and Roy, 2011, as well as the entry  logics for analyzing games).  This type of research delineates both the normative principles guiding the players’ strategic reasoning, and the psychological phenomena explaining the differences between predicted and observed behavior in games (Camerer 2003; Ghosh and Verbrugge 2018; Pacuit 2015; Meijering et al. 2012, 2014; Top et al. 2018).