As Information Systems get more complicated and specialized, Data Analysts find themselves in need of a better way to express more information in their models. Whether we are designing a cutting-edge transactional system or a data warehouse, we rely on our user community to define the business rules that dictate and validate the data. Further, we are beginning to realize the importance of not only a common repository of meta-data, but of the need to capture another layer of analysis, namely, a conceptual level of knowledge.