Logics in Artificial Intelligence : European Workshop JELIA 2000 Málaga Spain September 29–October 2 2000 Proceedings This book constitutes the refereed proceedings of the European Workshop on Logics in Artificial Intelligence JELIA 2000 held in Malaga Spain in September October 2000. The 24 revised full papers presented together with three invited papers were carefully reviewed and selected out of 60 submissions. The papers are organized in topical sections on knowledge representation reasoning about actions belief revision theorem proving argumentation agents decidability and complexity updates and preferences