The 6th InternationalConference on Cooperative Design, Visualization and - gineering CDVE 2009 was held in central Europe - Luxembourg. Participants from five continents came together to celebrate this annual event. Thepapers published in the conference in this volume reffect the new progress in the following aspect. Research in developing cooperative applications is currently focusing on two directions. One is the cooperation in the software development process and the other is the variety of the targeted cooperative software products. Many papers address how to facilitate cooperation in the software engineering process particularly global software engineering. The importance of sharing information in cooperation is emphasized by the authors. For example, papers that addressed the developmentof sharing mental models, tools for easilyshared projects,sh- ing links for cross-media information spaces, sharing resources and transfer of knowledge among team members etc. have attracted special attention. Many papers presented in this volume are the research results of tackling problems in developing a great variety of cooperative software products. The targeted systems are cooperative support for music creation, cooperative process m- agement systems, cooperative visualization systems for geographic information, cooperative cultural information sharing platforms, cooperative reasoning systems, cooperative sensor networks for environment monitoring, remote coop- ative video vehicle monitoring systems etc. Another aspect of the papers in this volume is dealing with the problems in—ner phases in the cooperative product production life cycle. The topics addressed range from partner selection for - operation at the beginning, requirement gathering, requirement negotiation, ooperativedesign, production to cooperative testing, and finally to cooperative system operation.