KC-Viz: A novel approach to visualizing and navigating ontologies

There is empirical evidence that the user interaction metaphors used in ontology engineering toolkits are largely inadequate and that novel interactive frameworks for human-ontology interaction are needed. Here we present a novel tool for visualizing and navigating ontologies, called KC-Viz, which exploits an innovative ontology summarization method to support a 'middleout ontology browsing' approach, where it becomes possible to navigate ontologies starting from the most information-rich nodes (i.e., key concepts). This approach is similar to map-based visualization and navigation in Geographical Information Systems, where, e.g., major cities are displayed more prominently than others, depending on the current level of granularity.