This volume is conceived as a rami?cation of the eighth conference on Logic and the Foundations of the Theory of Games and Decisions (LOFT8), which took placein Amsterdam, inJuly2008.Inall,61papersweresubmitted to thisevent, of which 48 were presented. This volume is based on a selection of the presented papers and the invited talks: they survived a thorough and lengthy reviewing process. The LOFT conferences have been a regular biannual event since 1994. The ?rstconference washosted by the Centre Internationalde RecherchesMathe- tiques in Marseille (France), the next four took place at the...