Studying the role of Persian Subject Headings in retrieving the children information resources from the Perspective of Librarians of Hamadan Province public libraries

The aim of this study was to investigate the role of subject headings librarians in public libraries of the province hamedan­'s resource recovery based on three components: the reader needs, unity subject of language issues.
The research method and survey method is applied. The questionnaire is self-made. The study population consisted of 40 public librarian’s province that holds the Knowledge and Information Science. For data analysis, descriptive statistics, frequency distribution, mean and standard deviation were used numerical indicators, to test the research hypotheses, one sample t-test and Kolmogorov-Smirnov Z was used and Cronbach's alpha 0/987. This questionnaire librarians in 3 specialization of subject headings principles include the need for the reader, the assessment of the unity of subject and language issues.
Findings: The findings indicate that the subject headings, thematic unity (3/29) and language issues with (2/80) and need reader (2/79), the highest average and role in their children's recovery resources.
The results showed that the hypothesis of the role of subject headings in children is very low recovery and use of its resources in this resource According to understanding the baby's bottom with positive feedback