Language Attrition among Kalhori Kurdish Speakers Living in Tehran

Human migration is the most significant characteristic of today's world. This may lead to different results including linguistic contact which by itself may bring about subtractive bilingualism or may lead to the attrition and death of the mother tongue. This study investigates the attrition and changes of mother tongue among Kurds of Ilam living in Tehran. This study seeks answers for questions like in which age groups can we see the most attrition and language changes? And also in which level (vocabulary or syntax) can we see these attrition and changes. This study was done among two separate groups of 30 Kalhori Kurdish speakers living in Tehran and 30 Kalhori Kurdish speakers living Ilam. A designed and validated Questionnaire was administered among the participants of the study. The results showed that changes and attrition occurred more frequently among persons under 20 in Tehran, they were more among women than in men and the most attrition and change was in vocabulary level.