This volumecontainsthe scienti?c papersacceptedforpublicationatthe conf- ence of the Italian Association for Arti?cial Intelligence (AI*IA), held in Reggio Emilia during December 9-12, 2009. This was the 11th conference of the series, whose previous editions have been held every two years since 1989, in Trento, Palermo, Turin, Florence, Rome, Bologna, Bari, Pisa, Milan and Rome again. The conference's scope is broad, and covers all the aspects of arti?cial int- ligence. Every edition has, however, an individual ?avor, and in this case, both by the choice of some invited speakers and of a...