Authentic assessment is a process of collecting, reporting and using information about student learning outcomes in the teaching-learning process. There are four forms of authentic assessment like project assessment, performance assessment, portfolio assessment, and self-assessment. In this research, the researcher focuses on investigate students in self-assessment. Self-assessment is an assessment where students can assess their self or identify strengths and weaknesses in their own work. It

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... also to realize the goals of student-centered learning. Self-assessment aims to help students to be independent learners. Self-assessment is considered important to the development of lifelong language learning skills and the development of more comprehensive assessment practices. One of Senior High School students from twelve grade in a rural school in Denpasar participated in this research. The research is based on the theory that metacognitive skills such as self-regulation and self-monitoring are important for the development of autonomous learning skills. Data were collected by observing them during the English class and at the end of the series of observations, and an interview session was conducted with each of them for triangulation. This research is also revealed that using self-assessment to assess young learners' writing skills is beneficial and effective in helping them to write in the English language classroom. The expected finding in this research is selfassessment had a positive impact or helping students and teachers in the teaching-learning process.