Title: Authorized Subject Headings in the Online Automatic catalog Environment An Empirical Study on a Sample of Arabic Records

Abstract: Subject headings are very important to machine catalogs, given the importance of thematic research. This study aims to measure the quality of a group of authorized subject headings with a sample of Arabic bibliographic records on the catalog of Egyptian university libraries by identifying the most important practices, policies, procedures followed, and tools used. In addition to assessing the actual capabilities of lists, thesaurus, and guidelines that were used in establishing thematic availability points. The study used both the descriptive analytical and evaluation approaches to achieve the study objectives.