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Knjižnica 53(2009)1-2, 61–76 62 Original scientific article UDC 025.3(078.7) Abstract Two studies in connection with the Functional Requirements for Bibliographic Records (FRBR) conceptual model are presented. While the model is based on experiences of experts, it is yet to have been tested in practice. The first study is an expert evaluation of two FRBR-based prototypes, FictionFinder and Library Labs, that took place in Jan- uary 2007. It found that FRBR facilitates better catalogue displays, however there are still problems with identification of FRBR entities. The second study is a study of men- tal models of the bibliographic universe, which is the first published study of its kind. It consisted of three tasks: cards sorting, concept mapping and comparison task. It was conducted on 30 participants from the Ljubljana area in the period between July 2007 and February 2008. Results show that there is not a single mental model of the bibliographic universe. Different individuals generally have different mental models and these generally differ from the FRBR model. Also, individuals’ mental models changed with the task. The more participants interacted with the bibliographic uni- verse, the more FRBR-like their models became. Hovever, on average mental models were found to be FRBR-like. Keywords: functional requiremnents for bibliographic records, bibliographic records, mental models, conceptual models 1 Uvod V informacijski dobi se knjižnice soočajo z vedno večjo količino informacij in gradiv, ki te informacije vsebujejo. Zato je pomembno, da knjižnični katalogi uporabniku pomagajo najti gradivo, ki ga išče, na čim bolj učinkovit način. Mnoga pomembna dela imajo knjižnice v različnih oblikah. Trenutno se uporabniki pri katalogih soočajo z dolgimi, nepreglednimi seznami, ki pogosto navidez naključno razpršijo izdaje nekega dela med izdaje drugih del. Zato bi uporabnikom poma- gali prikazi seznamov, ki bi bili bolj strukturirani. Trenutna praksa v knjižnicah ne pozna orodij, ki bi omogočala konsistentnost tovrstnih prikazov. Bibliograf- ski podatki večinoma prav tako ne omogočajo ugotoviti, kako sta dva zapisa povezana. Zato je prišel čas za nov pogled na bibliografski svet. Ena izmed možnih rešitev je model Funkcionalne zahteve za bibliografske zapise (FZBZ), ki so ga izdelali pod okriljem mednarodne knjižničarske zveze IFLA in izdali leta 1998. FZBZ je konceptualni model, ki predstavlja splošen pogled na bibliografski svet (Functional…, 1998). Od takrat je naletel na mešane odzive v knjižničarskih krogih.