Thisbookcontainstherefereedproceedingsofthe1st IFIP-TC6Working Con- rence on Wireless-On-Demand Network Systems, WONS 2004. It was sponsored by the IFIP Working Groups 6.3 (Performance of Computer and Commu- cation Networks)and6.8(Mobile and Wireless Communications), and aimed at becoming a premier international forum for discussions between researchers and practitioners interested in the evolution of Wireless Internet Access toward on-demand networking. Ad hoc, routing, localization, resource management, – curity, applications, performance and analytical models were topics covered in depth by technical papers in this book. Theconferencereceived77submissionsfrom22countries, showingthewor- wide interest. With so many papers to choose from, the Technical Program Committee’s job, providing a conference program with the highest quality, was challenging and time consuming. We ?nally selected 25 full papers for presen- tion in the conference technical sessions. To give researchers the opportunity to present the novel ideas they are starting to explore, we included in the technical program a poster session devoted to presenting preliminary research results: 7 short papers were selected for presentation in this session. Accepted papers and posters came from 15 di?erent countries. The technical program also included a keynote speech "Ad Hoc Wireless Networks: Protocols and Applications" by Prof. Mario Gerla, and a panel s- sion devoted to the discussion of the conference topics between academics and industry representatives. This event would not have been possible without the enthusiasm and hard work of a number of colleagues. A special thanks to the TPC members, and all the referees, for their invaluable help in reviewing the papers for WONS 2004.