Persian medical texts leveling for Non-Persian language speakers:a model based on Halliday's systemic-functional grammar

The aim of this study is to investigate the factors affecting the difficulty level of Persian medical texts for foreigners and to provide a model in order to leveling the Persian language teaching texts for foreign students who continue to study in medical sciences at the Iran's universities. The theoretical framework of the research is the Halliday's systemic-functional approach. The research methodology has qualitative components derived from the questionnaire measuring the factors affecting the difficulty level of the Persian medical texts that has been confirmed and its validity has been confirmed and foreign Persian students of the Persian Language Center of the Imam Khomeini International University(IKIU) have responded to it. The results of this study showed that the grammatical metaphor of nominalization of verb and adjective, adjectivization (subjective and objective) from verb, logogenetic patterns of wording, Specialized words, enhanced expansion ranking (parataxis and hypotaxis) and rank-shifting in the level of group, clause, and clause complexe, are the factors influencing difficulty in Persian medical texts. Also, the data provided the possibility of presenting a model of ​​ Persian medical texts leveling for foreigners within the framework of on Halliday's systemic-functional grammar. The suggested model can be used in the preparation and development of educational texts, language testing and evaluation of language skills of Non-Persian language speakers.