Integration of information systems have been attempted at different scales of operation: within one organization, across multiple organizations, for an infrastructure using standards such as CORBA and DCE. It is not easy to assemble application systems by using off-the-shelf CORBA objects under the prevailing infrastructure. The main problem of integration still remains that real-world objects can be modeled in many different ways. We propose to solve this multifaceted problem, by concentrating on only the information shared across information systems, while the information, that concerns an individual information system only, are not considered.