We present our first user study of CRAFT, a semantic prototype for investigation and analysis in which users collaboratively and implicitly extend the system’s ontology to capture new concepts as they conduct their work. We devised a paradigm in which multiple series of ontologies
evolve in different trajectories from the same initial oint. We analyze the ontology evolution quantitatively with
several metrics, and user behavior qualitatively through interviews and observation. Based on our study, we propose a set of design suggestions for semantic applications with collaborative and implicit ontology development.