This book constitutes the refereed proceedings of the First International Conference on Network-Based Information Systems, NBIS 2007, held in Regensburg, Germany, September 3-7, 2007 in conjunction with Dexa 2007.

The 55 revised full papers presented were carefully reviewed and selected from 122 submissions. The papers are organized in topical sections on recommender systems, business process / design aspects, mobile commerce, security and e-payment, Web services computing / semantic Web, e-negotiation and agent mediated systems, and issues in Web advertising.