This book constitutes the thoroughly refereed joint post-workshop proceedings of four international workshops organized by the Japanese Society for Artificial Intelligence, held in Miyazaki, Japan, in June 2007 during the 21st Annual Conference JSAI 2007. The volume starts with 7 award winning papers of the JSAI 2007 main conference that are accompanied by 24 revised full workshop papers, carefully reviewed and selected from the following four co-located international workshops: Logic and Engineering of Natural Language Semantics (LENLS 2007), International Workshop on Risk Informatics...