In this article, research carried out in Iran illustrating new developments in knowledge organ ization is reviewed. For this purpose, all relevant studies were identi fied and classi fied into three categories: (1) studies focusing on conceptual models; (2) studies focusing on the RDA standard; and (3) studies focusing on online library catalogs (OPACs), metadata, and labeling formats related to RDA and FRBR. LIS dissertations and theses were reviewed and categorized into these three groups. The results of each research were categorized. At the end, the research methods applied in these researches were analyzed and some suggestions for further studies are proposed.

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