Konvertering från UDK till SAB
The main purpose of this thesis is to examine what problems may arise when converting class symbols from one classification scheme to another. In order to fulfill this purpose, a conversion table between parts of the Swedish online-version of the UDC and the Swedish classification system SAB was constructed. For main classes 0 and 3 every class number from this abridged version of the UDC was converted, whereas for the rest of the main classes only class numbers with fewer than four figures were converted. The conversion table was constructed using the alphabetical index of SAB and different UDC-indexed library catalogues. Various aspects of the conversion table were then analysed using methods mainly devised by the authors themselves, but inspired by lexicography and multilingual thesaurus construction. The results show that most UDC main classes correspond to between one and four main classes in SAB, which is slightly more than expected considering that SAB has about 2,5 times as many main classes as the UDC. For UDC main class 3 as many as 17 SAB main classes were represented by at least one class symbol in the conversion table. Furthermore the analysis of equivalence levels shows a high degree of equivalence between terms from the two classification systems, and that very few UDC-numbers have no equivalent in SAB. These results may suggest that the structure of the two systems is largely similar, although the UDC is much larger than SAB which is the cause of most problems when converting.