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Early approaches to knowledge management focused on knowledge as a thing, because in those days technology focused on codification, but neglected the flow aspects. Knowledge flows along existing pathways in organizations. If we want to understand how to improve the knowledge flow (KF), we need to understand those pathways (Prusak, 2003)1. This is a key aspect, and it has stimulated the reflections in this chapter as to how Graphic Knowledge Representations (GKR) can support, foster and enhance knowledge sharing and development processes in CME, through the activation of non-formal and informal knowledge flow dynamics. The chapter discusses the results of an experimentation with graphic approaches to knowledge representation during informal learning processes based on problem-solving in the healthcare sector. The tools chosen for the experimentation were concept mapping and Petri Nets, developed collaboratively online with the aid of the CMapTool and WoPeD graphic applications. Our specific aim was to analyse and discuss their actual usability and effectiveness in fostering social interaction, knowledge-sharing and information exchange during a process designed to study a specific professional problem