The maintenance of the complex infrastructure and facilities of Port of Rotterdam is based on large amounts of heterogeneous information. Almost all activities of the Port require spatial information about features above- and under- ground. Current information systems are department and data oriented and cannot reflect the new process- & project-oriented needed for information exchange. Moreover most of the systems are able to process only two-dimensional data, while increasing number of 3D design models is becoming available. This complexity of activities and diversity of information challenges the Port authority to look for more advanced 3D solutions. This paper presents research in progress related to developing a 3D SII in support of information and process management within the Port of Rotterdam. The discussions and the research findings within this project are very relevant to the development of corporative information infrastructure for any large institution of a company.