Computerization of libraries, and what follows, transition to electronic system of
elaborating the resources, made many libraries stop running paper form catalogues, and also
produced a necessity of training the personnel in how to operate the Horizon integrated digital
library system. The aim of the abstract, is to show the changes that took place in the organizational
aspects in the Oddział Bibliotek Zakładowych of the University of Łódź due to introducing this
system, and the reasons which led to the closedown of the paper form Central OBZ Catalogue
