This proceedings volume contains the papers of the scientific program of the IFIP Working Group 8.I working conference on Situational Method Engineering: Fundamentals and Experiences. The conference has been held from 12 to 14 September 2007 at the University of Geneva in Switzerland. Since the early 1980s, the IFIP WG8.1 working conferences have provided a forum for the presentation and exchange ofresearch results and practical experiences within the field of information systems development methods. After two successful Method Engineering conferences in Atlanta in 1996 and in Kanazawa in 2002, it is now time again to provide a forum for the exchange of ideas in and give a state of the art overview in Method Engineering. The conference programme features three invited keynote presentations, paper presentations and one interactive panel session. Besides, tutorials have been arranged to learn about the basics of Method Engineering. The format of a working conference allows for extensive paper discussions featured by discussant reviews in plenary sessions. Over the last decade Method Engineering, defined as the engineering discipline to design, construct and adapt methods, including supportive tools, has emerged as the research and application area for using methods for systems development.