<![CDATA[This research aimed to investigate the effect of Grammar Focused Writing Instruction on the writing ability of tenth grade students in composing recount texts at MAN 1 Pasaman Barat. The researcher identified several problems including students difficulties in writing and grammar as well as monotonous learning resources. The research design used a purely quantitative approach with a quasi experimental design specifically a pre-test and post-test experimental and control group design. The population comprised all tenth grade students of MAN 1 Pasaman Barat. The researcher used purposive sampling to select class X.E.1 as the experimental group and class X.E.3 as the control group. Data were collected through a writing test. Furthermore the data were analyzed using non parametric statistical tests specifically the Wilcoxon Signed Rank Test and the Mann Whitney U Test. The results indicate that the post-test scores were significantly higher than the pre-test scores in the experimental group. The mean score of the experimental pre-test was 55.15 and the post-test was 81.67. The Wilcoxon Signed Rank Test for the experimental group showed a significant internal effect with a p value less than 0.001. Furthermore the Mann Whitney U Test comparing both groups resulted in a p value less than 0.001 proving a significant difference. The N Gain score for the experimental group was 0.59 indicating medium improvement compared to negative 0.2 for the control group. It is concluded that Grammar Focused Writing Instruction is highly effective in improving students writing ability compared to conventional methods.]]>
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