Spot the Difference: Monitoring Data Quality in COBISS.SI

The article outlines a pragmatic dimension-based approach for observing and measuring the quality of data values in bibliographic and authority records. The usefulness of this approach will be demonstrated on the example of the Slovenian Co-operative Online Bibliographic System & Services (COBISS.SI) which has implemented various data quality activities. Two examples of usability of dimension-based approach will be presented: 1) case from the activity identification of record groups with common error patterns and 2) an analysis of the daily bibliographic records production quality monitoring in the period from 2015 to 2020. Although the results show relatively good data quality, it has also been noticed that cataloguers should be more aware of changes in cataloguing practice.