Different Effects of Written Corrective Feedback and Explicit Grammar Instruction on Grammatical Accuracy of Rajabhat Maha Sarakham English Major students’ Paragraph Writing

Suwitchan Un-udom*

The Faculty of Humanities and Social Sciences, Rajabhat Maha Sarakham University  *Corresponding author: aodac269@gmail.com

Abstract
The current study aimed to investigate 1) the effectiveness of written corrective feedback (WCF) on students’ grammar accuracy in their paragraph writing, 2) the effectiveness of explicit grammar instruction on the students’ paragraph writing, and 3) different effects of the two methods on the grammar accuracy of students’ paragraph writing. The participants were 30 English major students of Rajabhat Maha Sarakham selected by purposive sampling. The 20 students were grouped into two experimental groups of 10 received written corrective feedback and explicit grammar instruction. Meanwhile, other 10 students were treated as the comparative group. The result of the comparative study using one way ANOVA and Post hoc analysis found that the participants in the two experimental groups outperformed the participants in the controlled group with the statistically different level at 0.5 (p=0.05). However, there was no significant difference between the two experimental groups. The result of the study was beneficial in designing the writing classrooms focusing on grammatical accuracy in terms of choosing the way to improve students’ performance.

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