عنوان مقاله [English]
The development of science and technology, the production of new words, the increase of scientific publications, the words entered by users into the information organization, and changes in the semantic relations between concepts and topics are a set of reasons for updating thesauri. In this research, increase in the quantity of terms, editing of terms, and development of semantic relations between the terms of scientific and technical thesauri developed at Iranian Research Institute for Information Science and Technology (IranDoc), has been done. The process of updating and developing, including the stages of literature review and provision of resources, design or examination of the concept maps, the vocabulary translation, the identification of semantic relations, the unification, the control of relations and errors, the production of thesaurus outputs, editing, and publication. In the process of development and updating, 90,000 words were added to the previous set of terms, also semantic relations between terms developed and improved. Also in this project, the web service of the updated thesaurus was designed and implemented and is now accessible via IranDoc website. This site can be a good guide for users and indexers in organizing and retrieving information.