The purpose of this Bachelor’s thesis is twofold. Firstly it aims to make a contribution to the understanding of how five Swedish Diocesan libraries have carried out the digitizing of their rare book and manuscript collections. Problem areas related to this activity are also investigated. Secondly, it aims to examine the relative guidelines and standardization norms, which have been formulated on a national basis. The research questions posed are: Which problem areas connected to the digitizing activities carried out at the Diocesan libraries can be identified in the empirical material? Which possible discrepancies might be found comparing the digitizing activity at the Diocesan libraries and the guiding principles on a national level? In order to find answers to the research questions, interviews with six librarians at the Diocesan libraries were conducted. Furthermore, using the method of content analysis, the interviews, literature, previous research, reports and in-house documents were examined. The theoretical framework used is a triangular model formulated by the museologist, Ivo Maroević, indicating the relationship between the institutions of cultural heritage: archives, libraries and museums. The particularity of the collections of the Diocesan libraries places them in the middle of the triangle. The most important problem areas were found to be connected with: economical and personnel resources, outsourcing and open access, preservation, storage, and the national strategy for digitization. The major discrepancy with national recommendations consists in the differences of the digitization process at the Diocesan libraries, depending on whether it is related to a project or on demand.