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This research aimed to explain the effectiveness of Peer Assessment in improving writing skills of students with different grammatical competencies at SMA Negeri 3 Palangka Raya. The researcher used pre-experimental research. This research consisted of one group pre-test and post-test design. Before students do the pre-test and post-test, they do the grammar test to know their grammatical competencies. Then, the pre-test and post-test scores were calculated in the achievement of student’s writing skills using Peer Assessment. The sample of this research is tenth grade students consisting of 30 students. Result of this study is from the test ANOVA, which showed an effectiveness of Peer Assessment on the student’s writing. The mean score of pre-tests is 63.26 and after the treatments is 72.17, it concluded that there is a rising score of students with low grammatical competencies. It raises 8.91 points. It means that students with low grammatical showed the improvement. Keywords: Peer Assessment, Writing Ability, Descriptive Text, Grammar Levels
Nachalia et al. (Fri,) studied this question.