Logics in Artificial Intelligence

This volume contains the papers selected for presentation at the 11th European Conference on Logics in Arti?cial Intelligence (or Journ´ ees Europ´ eennes sur la Logique en Intelligence Arti?cielle, JELIA), which was held from September 28 to October 1, 2008, at the Technische Universit¨ at Dresden, Germany. In total, 98 researchpapers were submitted by researchersfrom 24 countries. Each submission was reviewed by at least three expert reviewers. The ?nal de- sionsonthepapersweretakenduringanelectronicProgramCommitteemeeting held on the Internet. The Program Committee accepted 32 research papers for presentation at the conference. This includes two summaries of master theses that won the best thesis awardof the EuropeanMaster'sProgrammein Com- tational Logic (EMCL) in 2006 and 2007, respectively: the paper by Magdalena Ortizon"ExtendingCARINtotheDescriptionLogicsoftheSHFamily"andthe one by Novak Novakovic on "Proof-Theoretic Approach to Deciding Subsu- tion and Computing Least Common Subsumer in EL w. r. t. Hybrid TBoxes. " The program also included three invited lectures by Sergei Artemov, Ruth Byrne,andJ´ erË omeLang. Thelecture byRuth Byrnewasgivenjointlyto JELIA 2008 and to the 9. Fachtagung der Gesellschaft fu ¨r Kognitionswissenschaft (9th Symposium of the German Cognitive Science Society), which was held in par- lel at the Technische Universit¨ at Dresden. Also colocated with JELIA 2008 were the9thInternationalWorkshoponComputationalLogicinMulti-AgentSystems (CLIMA-IX) and the 22nd Workshop on (Constraint) Logic Programming (WLP 2008). Many people contributed to making JELIA 2008 a success. We thank the authors of the submitted papers, which were of very high quality and covered a broadrange of topics including belief revision,descriptionlogics,non-monotonic reasoning, multi-agent systems, probabilistic logic, and temporal logic.