Abstract: This is a qualitative single study research aimes at developing a growth portfolio in English writing of an eleventh grader student in one public school in Ma�an. Hence, the basic question of this study is to investigate whether English writing performance made for this study show a significant in ability due to using portfolio. The sample of the study was chosen purposively from one of the eleventh grade classes in Ma�an secondary school for girls in coordination with her teacher. She had to produce five pieces of writings in English which makes about two thirds for her English writing assignments for the first semester. The works were estimated twice: once by the researcher, then by the teacher using the rubric designed for grading Arabic writing rubrics now in use by the ministry of Education, but was adapted and translated by the researcher and juries to achieve the purpose of this study. Generally, the final portfolio showed that there was a progress made against estimation criteria used in the rubric throughout the writing pieces in favor of using this method and through explanation the result was included.