Abstract
Seeing the observation result, the evidence from teachers' reports and final tests show that writing is the weakest aspect of students' work in English and supported by semi-structured interview given with a group of students having problem in English writing. The method was pre-experimental, and the Eighth grade of A is chosen as the sample. The findings show that there is significant difference in the mean score between students’ writing before and after treatment. It is also indicated from the result of hypothesis testing, it results in Ho is rejected because 0.000 < 0.025 (2-tailed) and based on t-test criteria, if t-test is bigger than t-table, it means that Ha is accepted and Ho is rejected. Besides students’ writing skill achievement with portfolio assessment is better than students without the assessment at the level of believe 95%. Portfolio assessment has positive correlation with students’ writing skill, it shows from the result of r-test in this study is 0.671 and the level of correlation is in the level of strong. Therefore, the assessment of teachers should have well-prepared materials, assignments, and other activities being appropriate time and it is better implemented in small class because it can be easily managed.
Highlights
One of the goals in mastering language is to improve students’ communication achievement, either in oral or written form
The students do not English Writing Test The English writing test is developed to assess the students' writing skill in English, the instrument is subjective test which asked the ask too much about how to answer the test. It means the instruction of the test is not needed to be revised because it is understandable for the students
The subjects show a satisfactory improvement with reference to each writing product skill
Summary
One of the goals in mastering language is to improve students’ communication achievement, either in oral or written form. Whereas both skills show what is encoded from. In term of the skills which is called as one of the micro abilities that is salient for effective communication (Aprianto and Zaini, 2019). The first function of language is a tool of communication. Communication is a process of forwarding speakers' intention to others by using certain channel either in oral or written. Having ability of productive skill might be beneficial to work with in terms of communication among the people in the world
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