This volume contains the proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), which is an annual event that, for the ?rst time, was hosted in the UK. Conceptual structures focus on the representation and analysis of concepts, events, actions and objects with applications in - search, softwareengineering, manufacturing and business.The conference brings together researchersin computer science, information technology, arti?cial int- ligence, philosophy and a variety of applied disciplines to explore novel ways that information technologies can be leveraged to...