ABSTRACT. In this empirical study of a sample of catalog records I investigate the implications for information retrieval of the rules for choosing author access points in online catalogs. Aims: To obtain data that can be used to inform a revision of current cataloguing rules, and to propose more functional criteria aimed at improving the retrieval of information located on the basis of author names. Material and methods: A total of 838 records from the Biblioteca Nacional Española (Spanish National Library) were examined to analyze the use of authorities as access points. Authors were classified as creative or non-creative to facilitate the analysis. The variables investigated were author source location, potential author access points, actual entries used in the record, and loss of potential entry points. Results: A total of 3566 potential author access points were identified (mean of 4.25 per record). The title page yielded 57.3% of all potential access points, the table of contents yielded 33.5%, and other sources accounted for the remaining 9.1%. A total of 2125 potential authors were not used as access points in the records (overall loss of 59.5%). A total of 960 authors named on the title page were not used as entries (30.23% loss). In works with up to three authors per responsibility function, 24.8% of the authors were not used as entry points. In works with more than three authors, 75.2% of the potential access points were un-