This book constitutes the refereed proceedings of the 9th International Conference on Web
Engineering ICWE 2009 held in San Sebastian Spain in June 2009. The 22 revised full papers
and 15 revised short papers presented together with 8 posters and 10 demonstration papers were
carefully reviewed and selected from 90 submissions. The papers are organized in topical
sections on accessibility and usability component-based web engineering: portals and mashups
data and semantics model-driven web engineering navigation process planning and phases
quality rich internet applications search testing web services SOA and REST and web 2.0.
