Mohamadreza Farangi - PhD, TEFL, Shiraz University, Shiraz
Amirreza Houshmand - BA, TEFL, Bojnord Farhangian University,Imam Mohamad Baqer Center, Bojnord

This study investigated the extent to which two types of scaffolding, namely Symmetrical and/or Asymmetrical Scaffolding could contribute to the acquisition of grammar among Iranian EFL sophomores. To fulfill this objective, 42 female college students who aged between 19 and 24 were selected through convenience sampling and, after taking a pretest, divided into two groups of: Symmetrical scaffolding (SS), Asymmetrical scaffolding (AS). The experimental group AS received instruction according to asymmetric strategy while the experimental group SS was instructed via the symmetric strategy. To answer the research questions a post-test was conducted, and its results were analyzed using independent and paired t-test. The results showed that AS scaffolding is a more fruitful strategy in improving participant's grammar achievement. The results could have some implications for instructors and teachers regarding how to help each other in the process of learning

ZPD, symmetrical scaffolding, asymmetrical scaffolding, grammar