This volume is a result of ISD2000 - The Ninth International Conference on Information Systems Development: Methods and Tools, Theory and Practice, held August 14-16, in Kristiansand, Norway. The papers presented at ISD2000, and contained in this volume, reflect changing times. In addition to the "traditional topics", several papers examine new arenas for systems development, such as e-commerce and new technologies and tools to develop systems, such as XML. The whole process of systems development, from defining information needs, and modelling requirements, to implementing and managing information systems, is represented in this volume. Papers also address philosophical and paradigmatic assumptions of Information Systems Development.