: One of today’s hottest IT topics is integration, as bringing together information from different sources and structures is not completely solved. The approach outlined here wants to illustrate how ontologies [Gr93] could help to support the integration process. The main benefits for an ontology-based approach are - the ability to picture all occurring data structures, for ontologies can be seen as nowadays most advanced knowledge representation model - the combination of deduction and relational database systems, which extends the mapping and business logic capabilities er degree of abstraction, as the model is separated from the data storage - its extendibility and reusability First we will give a motivation for our approach and build the requirement