(Universidad de Murcia, Servicio de Publicaciones, 2021) Barouni Ebrahimi, Alireza
Derivational knowledge is associated with writing and speaking skills. These skills are essential for EFL students
who express themselves in oral presentations or written assignments. Therefore, diagnostic measurement of
productive derivational knowledge is of vital importance, especially in regard to the most frequent 1,000 word
families that cover 81% and 85% of written and spoken text. This study measured 46 Iranian university EFL
students’ productive derivational knowledge of the words at the 1,000 word frequency level. The findings indicate
that while participants had the productive form-meaning knowledge of the words at 1,000 level, they did not
seem to have extensive derivational knowledge of the same wo