A Study on the Effect of Dynamic Assessment on EFL Writing

This paper attempted to explore the effect of Dynamic Assessment (DA) on EFL learners'writing ability. In order to do the research, 18 university students from Islamic Azad University, South Tehran Branch, majoring in Civil Engineering was chosen. DA intervention based on a regulatory scale by Aljaafreh and Lantolf (1994) was exercised for instrumentationpurpose. The students were required to write a composition and compare concrete structures with each other as a pretest. The next step was applying DA intervention. At last, a posttest was run. Applying the regulatory scale revealed that students were different in their developmental levels, implying that DA approach can be considered to be useful for the students' writing ability.