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50 ORGANIZACIJA ZNANJA 2014, LETN. 19, ZV. 2 for librarianship at the Academy of Pedagogical Sciences, he became the first Slovenian university lecturer for cata- loguing. (Enciklopedija Slovenije, 1990, zv. 4, p. 371) As the leading expert in cataloguing he thoroughly studi- ed international trends and introduced a modern approach to cataloguing into all types of libraries by publishing articles and papers dealing with cataloguing issues, ma- inly in descriptive and partly also subject cataloguing. He actively took part in many international symposia until his retirement. Pavle Kalan was also involved in professi- onal terminology in librarianship. From the sixties to the eigthies Twenty years later, in 1967, after a very long period of hard work and taking into account international trends, the second edition of the cataloguing code was published. Once again, the compilation was undertaken by Pavle Ka- lan, this time based on the Paris Principles, which he hel- ped set up with his contributions on the notation of proper names. While he was working on Abecedni imenski kata- log 67, the National and University Library in Ljubljana excused Pavle Kalan from his everyday duties and acti- vities for a year to allow him to concentrate fully on the preparation of the new edititon of cataloguing rules. The development of ISBDs on the international level in the 1970s was soon incorporated in Slovenian translations by Maks Veselko (1926–), another cataloguing reseacher and university lecturer. With the approval of international standards for bibliographic descriptions, and their wide acceptance in the library environment, part of Abecedni imenski katalog 67 proved out-of-date, but nevertheless it should be noted that AIK 67 and its rules for determining access points together with ISBDs were in use for a very long time and formed the basis of modern cataloguing. Meanwhile, the idea of a unique cataloguing code for the territory of the former Yugoslavia was fully supported and carried out by Eva Verona (1905–1996), mathemati- cian by education, cataloguer by profession. She worked at the National and University Library in Zagreb (Croa- tia) her entire life and by publishing theoretical articles and bibliographies became a world-renowned cataloguing expert (Horvat, 2005). All the hard work on the Yugoslav cataloguing code could not have been done without the help of cataloguing experts in all national libraries of the former Yugoslavia engaging in lively discussions on the manuscript and providing different examples. The results of this intense work and collaboration were published in two extensive volumes of Pravilnik i priručnik za izradbu abecednih kataloga known as PPIAK in 1970 and 1983, followed by the 2nd edition of volume 1 in 1986. It was and still is one of the most complex and complete cata- loguing manuals with numerous examples in different languages. Central cataloguing of the Slovenian printing production (Jugovec, 1964) was introduced in Slovenia in the late 1960s and carried out once again by the National and University Library with the full support of the Slovenian Library Association. The beneficiaries were scientific, academic, public and school libraries. Between 1977 and the beginning of the 1990s catalogue cards had also been exchanged among the national libraries (Veselko, 1978). Cataloguing knowledge and special librarians' skills were concentrated in national libraries, where PPIAK was used in its original language along with the translations of ISBDs as unique cataloguing tools. The nineties and later The late 1980s and early 1990s were very stressful and turbulent. New and revised editions of ISBDs were pub- lished and it was decided that UNIMARC was going to be used as the prescribed format for the exchange of bib- liographic records. COBISS was in full progress when in 1991 it faced new challenges due to the disintegration of Yugoslavia. In Slovenia, scientific and academic libraries as well as public and school libraries all joined COBISS, because of which new knowledge, expertise and skills were required from librarians. The system itself quickly revealed the differences in cataloguing practice in differ- ent libraries, the quality of bibliographic records in gener- al being rather poor. Different measures were undertaken to improve that, such as: • The role of the principal catalogue editor was introdu- ced on the initiative of the Slovenian Library Associa- tion, carried out and fully supported by the National and University Library in 1993. • Before cataloguers were able to start working within the system, they had to pass a test creating a certain number of bibliographic records, which were checked and evaluated by the principal catalogue editor as well as IZUM. Recommendations to correct bibliographic records and further individual instructions were provi- ded. The evaluation system is still in use today. The basic duty of the principal catalogue editor is the precise coordination of bibliographic processing regar- dless of the type of library material. Together with IZUM, the principal catalogue editor is the curator of the MARC structure, thus, insuring flawless data exchange. The coordination applies to two basic areas: • complying to unique codes of bibliographic descripti- on, e.g. international standards, PPIAK and rules for Alenka Kanič: CATALOGUING RULES AND THEIR CHANGES