EN
The authoress discusses the concept of relationship management based on the knowledge of library users and stresses that contemporary libraries need to be evaluated by their users in order to function properly in the society. Needs and opinions of library users should be surveyed and taken into consideration in library everyday work. Library users should not be treated as passive recipients of library services but rather partners to be involved in cooperation and knowledge sharing. Finally, the authoress presents basic sources of knowledge on users and tools for measuring the quality of library services as the starting points for introducing improvements in libraries.