  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.
