This book contains a collection of thoroughly revised tutorial papers based on lectures given by leading researchers at the Second International Summer School on the Reasoning This book contains a collection of thoroughly revised tutorial papers based on lectures given by leading researchers at the Second International Summer School on the Reasoning Web in Dresden, Germany, September 3-7, 2007. The objective of the book is to provide a coherent introduction to Semantic Web methods and research issues with a particular focus on reasoning. The nine tutorial papers presented provide competent coverage of methods and research issues of the Semantic Web, ontology languages and their relation to description logics, Web query languages, XML, RDF and Topics Maps, evolution and reactivity, personalization in the Semantic Web, rule modeling with UML, techniques in Web information extraction, employing ontologies to ease construction of software applications, and type checking for Web rule and query languages.