Welcome to the proceedings of the 1st International Conference on Network- Based Information Systems (NBi S-2007), in conjunction with the 18th Inter- tional Conference on Database and Expert Systems Applications DEXA-2007, which was held in Regensburg, Germany, September 3-4, 2007. The main objective of NBi S-2007 was to bring together scientists, engineers, and researchers from both network systems and information systems with the aimofencouragingtheexchangeofideas, opinions, andexperiencebetweenthese two communities. NBi S started as a workshop and for 9 years it was held together with DEXA International Conference and is the oldest among DEXA Workshops. The wo- shop has been very successful in quantity and quality. We received many paper submissions every year, but as a workshop we could accept only a limited n- ber of papers. This was the ?rst year that NBi S was run as an international conference together with DEXA. We received 122 research papers from all over the world. The submitted papers were carefully reviewed by at least two reviewers. Based on the review results, the Program Committee members selected 55 high-quality papers to be presented during the NBi S-2007 conference.