This book constitutes the thoroughly refereed post-proceedings of the Third Conference on Professional Knowledge Management - Experiences and Visions, WM 2005, held in Kaiserslautern, Germany in April 2005. The 82 revised papers presented were carefully reviewed and selected from the best contributions to the 15 workshops of the conference. Topics addressed were intelligent office appliances, learning software organizations, learner-oriented knowledge management and KM-oriented e-learning, peer-to-peer and agent infrastructures for knowledge management, knowledge intensive business processes, german workshop on experience management, knowledge management in medicine, knowledge management in international professional services firms, knowledge management for distributed agile processes: models, techniques, and infrastructure, knowledge management and business intelligence, intelligent IT tools for knowledge management systems, semantic model integration, workshop on philosophy and informatics, workshop on information just-in-time, and knowledge management in small and medium enterprises.