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The 13th International Conference on Human–Computer Interaction, HCI Inter- tional 2009, was held in San Diego, California, USA, July 19–24, 2009, jointly with the Symposium on Human Interface (Japan) 2009, the 8th International Conference on Engineering Psychology and Cognitive Ergonomics, the 5th International Conference on Universal Access in Human–Computer Interaction, the Third International Conf- ence on Virtual and Mixed Reality, the Third International Conference on Internati- alization, Design and Global Development, the Third International Conference on Online Communities and Social Computing, the 5th International Conference on A- mented Cognition, the Second International Conference on Digital Human Modeling, and the First International Conference on Human Centered Design. A total of 4,348 individuals from academia, research institutes, industry and gove- mental agencies from 73 countries submitted contributions, and 1,397 papers that were judged to be of high scientific quality were included in the program. These papers - dress the latest research and development efforts and highlight the human aspects of the design and use of computing systems. The papers accepted for presentation thoroughly cover the entire field of human–computer interaction, addressing major advances in knowledge and effective use of computers in a variety of application areas.

Thesearetheproceedingsofthe21stInternationalSymposiumonComputerand? Information Sciences (ISCIS 2006) held in Istanbul, Turkey, November 1 – 3, 2006. ISCIS 2006 was organized by the Faculty of Engineering and Natural S- ences of Sabanc?University. These proceedings include updated versions of 106 papers selected by the program committee for presentation at the symposium. The increasing com- tition for presenting at the symposium, which relies on the success of previous ISCIS symposia,has led to many excellent papers and a higher standard overall. From a record-breaking 606 submissions, scheduling constraints dictated that only 106 papers could be accepted, resulting in a 17.5% acceptance rate. The program committee and external reviewers worked very hard and went through all submissions meticulously to select the best in a limited time frame. The selection process was especially hard when some of the good submissions could not be selected for publication due to space and time limitations. Another interesting fact about the submissions is that they were by authors from 41 countries covering all habitable continents (excluding Antarctica). This is a clear indication of the ever-increasing popularity of ISCIS symposia among researchersallaroundtheworldasamediumtoshareanddisseminatetheresults of their research activities.