Sjir Nijssen

Professor Nijssen started with fact-based modeling in the late 1960's at the Dutch National Institute for Informatics. He made this his full time job in 1970 at the European headquarters of Control Data (a pioneer in the field of computer science) in Brussels. It was there where first ENALIM (Evolving Natural language Information Model) and later NIAM (Natural language Information Analysis Method)  a fact based business practice and notation, was conceived, including tool support.

During this time, he was also associated with academic institutions and international standards organizations. He has served as first Chairman of IFIP WG 2.6 (Databases), member of WG 8.1 (Information Systems) and member of ISO TC97/SC5/WG3 (Concepts and Terminology for the Conceptual Schema and the Information Base [ISO TR9007, 1987], In 1978 he published a 100+ page monograph outlining the foundation of what is now called Fact Based Modeling and which became the basis for the ISO TR9007. In 1981 he published a paper outlining what is now represented using the Knowledge Triangle. In 1982 he wrote the first version of the NIAM cookbook (CSDP) to be used by students at the University of Queensland, Australia and commercial businesses through Control Data Australia.


During the period of 1982 to 1989, professor Nijssen was a fulltime professor at the University of Queensland (Brisbane, Australia). At that university he worked with senior lecturer Eckhard Falkenberg, and after 1986 with Terry Halpin in large scale teaching and further developing NIAM.

When returning to the Netherlands in 1989, he founded PNA Group and accepted a position at Maastricht University, the Netherlands. After several years, he focused entirely on PNA Group; a company exclusively dedicated to business requirements and integrated business modeling using logic, natural language and a business friendly extensive protocol. The methodology used at PNA Group, called CogNIAM (Cognition enhanced NIAM) is a full integration of data, process, behavior, semantics and human communication aspects of an integrated business model.

Professor Nijssen published more than 50 articles and 10 books.