Agus Mulyana Penguji 1 Imam Sudarmaji Dosen Pembimbing 2 Nirna Nirmala Penguji 1 Khusaini Dosen Pembimbing 1 Isnaniah Ketua Penguji Ophie Alivia Fadillah Pengarang

Identifying appropriate writing techniques to help students with different self-esteem improve their writing skills is a concern for educators. This study tries to test the effect of the Reflective Learning Portfolio (RLP) technique in improving students' writing ability with different self-esteem. Quasi-experimental design was used in this study. The study participants totaled 76 students from SMAN 13 Kabupaten Tangerang which were divided into two groups, namely, the experimental class consisted of 38 students and the control class consisted of 38 students. A set of questions to measure student self-esteem and a written test were used to collect data. Questionnaire results data were analyzed using a Likert scale. The results of the pre-test and post-test to determine the effect of RLP were carried out using a independent T-test and ANOVA test. The results showed that in the experimental class was much better than the control class.