Due to lower MAP in previous English-Persian dictionary based information retrieval methods comparing with Arabic, France and German, it seems an essential research area finding out sources of errors. Simplicity, availability in most language pairs and furthermore universality property of dictionary in more subjects, makes dictionary an unavoidable translation source.
Dictionary based information retrieval refers task of retrieving documents related to a query which their language is different from it's language by using translation list of query terms in a bilingual dictionary. Ambiguity and coverage of dictionary specially in English-Persian available dictionaries make this study an important field. Studying with more depth finding out sources of errors in translation and solving such related problems are main purpose of study.