This book constitutes the refereed proceedings of the 9th International Conference on Computers Helping People with Special Needs, ICCHP 2004, held in Paris, France, in July 2004. The 172 revised contributions presented were carefully reviewed and selected for inclusion in the book. The papers evaluate how various fields in computer science can contribute to helping people with various kinds of disabilities. Among the technical fields evaluated are information systems, Web and Internet, the information society, computer-assisted education, human-computer interaction, interface design, virtual reality, mobile computing, ubiquitous computing, pervasive computing, assistive technology, multimedia, display technology, haptic computing, audio interfaces, ad societal and administrative issues.