Reviewing the conformity and updating persian subject headings in comparison with the titles of persian books published in 1384 -1388 on Iranian N.L.D

To evaluate the conformity of subject headings for the books published in Persian with those of the Database of National Library of Iran from 1384 to 1388. Methodlogy: The research data randomly selected from the bibliography of the Database of National Library of Iran. After sampling، the samples totaled 2493 titles which was determinded as the stratified Dewey Classification. The statistical population was 278237 titles in 1384-1388. Because of the main work was based on the ten classified subjects of Dewey Classification، the references of the “see”، “see also” and “see under” were calculated for the determination of the conformity scale of titles and subjects.. There was conformity about 99. 9 percent between the titles and subjects selected from the Persian Subject Headings. Also، there was conformity in 1 percent of the total books surveyed through references of “see under” and 0. 5 percent through “see” and 0. 3 through “see also” references with the titles of the books. According to the research findings، there are conformity of 100 percent in the classifications of social science، language، pure science، practical science، arts and entertainments، literature، history، geography and the related sciences.. Also، Religion 99/ 8 percent، generalities 99/6 percent، philosophy and psychology 99/2 percent، benefit the highest level of conformity with the titles and subjects of books of which three titles of books، that is، one title related to religion، one title to generalities، one title to philosophy and Psychology، had no conformity with the assigned subjects.