During the five years of activities the documentation centre at the Royal Institute of Technology has established itself as an information centre in the fields of science and technology. The SDI service is now well implemented and its activities are used and appreciated by scientists, research workers and engineers at the universities, research institutions and in the industrial communities. Techniques for on-line SDI-query formulation and query alternation adaptive to user feedback are under development. The on-line connection to the NASA:s Recon system in Darmstadt enables us to make retrospective searches in interactive mode. Research is going on for linking up the Swedish network for Library Information system - LIBRIS - with international data banks with the objective to achieve a comprehensive information retrieval system for the whole country. (Author)