As of 2009, the discipline of Web engineering is a well-established and mature ?eld of research within the software engineering, database, information te- nology, and other related communities. By its very nature, Web engineering is, therefore, a multidisciplinary ?eld that is beginning to establish ties even o- side the domain of computer science. As a discipline, Web engineering system- ically applies the knowledge of Web science to the development and evolution of Web-based applications and systems. This volume contains the proceedings of the 9th International Conference on Web Engineering (ICWE 2009), which was heldinSanSebasti´ an,SpaininJune2009. TheICWEconferencesareamongthe most essential events of the Web engineering community. This fact is manifested both by the number of accomplished researchers that support the conference series with their work and contributions as well as by the continuing patr- age of several international organizations dedicated to promoting research and scienti?c progress in the ?eld of Web engineering. ICWE 2009 followed conferences in Yorktown Heights, NY, USA; Como, Italy;PaloAlto,CA,USA;Sydney,Australia;Munich,Germany;Oviedo,Spain; Santa Fe, Argentina; and Ca ´ceres, Spain. With San Sebasti´ an as this year's venue, the conference series visits the country where it was originally launched in 2001 for the third time. This year's call for papers attracted a total of 90 submissions from 33 co- triesspanningallcontinentsofthe worldwithagoodcoverageofallthe di?erent aspects of Web engineering.
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.