Subject analysis, thesaurus; its characteristics, and importance, the differences between thesaurus and lists of subject headings, selection of terms and descriptors and their relations. Building thesaurus; structure, development and updating. Arabic and foreign thesaurus. Retrieval languages. The concept of subject cataloging, functions and importance. Principles and selections of subject headings. Forms of subject headings and structures, and cross-references. Arabic lists of subject headings, and practicum.