The RNA project deals in a very practical way with methods, tools and techniques for building dynamic knowledge systems. In these systems a key role is played by reference networks, sets of reference structures (like thesauri, taxonomies, etc.) and related content metadata. The project is financed by the Dutch Ministry of Economic Affairs under the auspices of the Ministry of Education, Culture and Science. It is a combined effort of a group of innovative small companies, vanguard institutions in the cultural heritage field and outstanding, internationally acclaimed academics.