The summer school is intended to foster reflection on economic models of rational as well as bounded or irrational decision, focusing on their explanatory power as well as normative/policy implications. The status and interpretation of the parameters and variables of these models will also be a key issue: Are psychologistic interpretations of preferences and beliefs, for example, justified by experimental data? Or have traditional instrumentalist and behaviourist interpretations been unchallenged by the emergence of behavioural and experimental economics?