The fundamental purpose of the survey was to determine, which elements of the COBISS system and processing of library materials within the Slovenian union catalogue in general are perceived as good by active cataloguers and to expose what still needs to be improved. Findings of the survey showed that cataloguers are satisfied with the COBISS cataloguing module, its reliability, efficiency and effectiveness. Their opinion of the overall usability is also very good. Cataloguers rate users’ manuals and training for COBISS cataloguing module as good. The procedures of certification for active participation on shared cataloguing is rated slightly lower, however the results are still good. Findings also showed that cataloguers perceive the framework of uniform processing of library materials as very positive, but unfortunately results also confirm that in practice the efforts of maintaining the high standards are only occasional.