Agents and Artificial Intelligence : International Conference ICAART 2009 Porto Portugal January 19 21 2009. Revised Selected Papers This volume constitutes the thoroughly refereed post conference proceedings of the International Conference on Agents and Artificial Intelligence ICAART 2009 held in Porto Portugal in January 2009. The 21 revised full papers presented together with one invited paper were carefully reviewed and selected from 161 papers. Based on the same structure as the conference the book is organized in two simultaneous tracks: Artificial Intelligence and Agents This volume constitutes the thoroughly refereed post conference proceedings of the International Conference on Agents and Artificial Intelligence ICAART 2009 held in Porto Portugal in January 2009. The 21 revised full papers presented together with one invited paper were carefully reviewed and selected from 161 papers. Based on the same structure as the conference the book is organized in two simultaneous tracks: Artificial Intelligence and Agents.