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 dedicated workshop, we stressed the growing importance of complex systems methods and ideas in AI. Eighty-two papers were submitted from 13 di?erent countries located in four continents, and the Program Committee selected the 50 papers which are p- lishedinthisvolume.IwishtothankallthemembersoftheProgramCommittee and the other reviewers for their excellent job. The three invited speakers, who provided a fundamental contribution to the successoftheconference,wereShayBushinsky(Haifa), MarcoDorigo(Brussels) and Paul Verschure (Barcelona). The conference also hosted a number of interesting workshops, which raised considerable interest and participation: "Bio-logical: Logic-Based Approaches in Bioinformatics," organized by Stefano Ferilli and Donato Malerba. "Complexity, Evolution and Emergent Intelligence," organizedby Marco Villani and Stefano Cagnoni. "Evalita 2009: Workshop on Evaluation of NLP and Speech Tools for Italian," organized by Bernardo Magnini and Amedeo Cappelli. "Intelligent Cultural Heritage," organized by Luciana Bordoni. "Intelligenza Arti?ciale ed e-Learning," organized by Giovanni Adorni. "Pattern Recognition and Arti?cial Intelligence for Human Behavior Analysis," organized by Luca Iocchi, Andrea Prati and Roberto Vezzani.
