ACKNOWLEDGEMENT i

First of all, we are grateful to the organizers of INTERACT 2005, who have granted us the valuable opportunity to hold our Workshop “International COST294 Workshop on User Interface Quality Models (UIQM) ” in conjunction with the conference, and also provided the timely support for printing this Workshop’s Proceedings. Thanks must also go to the authors of the Workshop papers, whose contributions serve as rich sources of stimulation and inspiration to explore the issues of interest from multiple perspectives. The quality of the contributions could further be ensured and improved with the generous help of a group of reviewers, who are leading researchers and experts in the field of usability evaluation. Their prompt responses to our calls for peer review, and their effective as well as efficient review works are highly appreciated