Improving students` ability in writing through collaborative writing strategy at the Islamic Junior High School Muhammadiyah 01 Medan

The objective of this research is to know the improving of Collaborative Writing Strategy in Students’ ability in writing Descriptive Text and to find out whether the improvement Students’ Acbility in Writing Descriptive Text through Collaborative Writing Strategy. This research was conducted at MTs Muhammadiyah 01 Medan academic year 2017-2018 as the subject of researcher. The subject of this research were consisted of 21 students of the eighth grade in class VIII. The research was conducted with Classroom Action Research. In conducting this classroom action research, the writer divided the action into two cycles. The instrument of collecting data were qualitative data from observation, interview, diary notes, and documentation. Quantitative data were taken from tests, which was carried out in the end of every cycle. Based on the result of the data analysis showed that there was an improvement of the result of the students’ achievement in writing descriptive text from each cycle. After doing Post-Test cycle I, there was an improvement of the result of the students’ mean was 65,7. Where, 11 students who got successful score criteria above 70 or it was only 50 % and 10 students who got unsuccessful score criteria above 70 or it was 50 %. Then, doing an improvement in second cycle after reflection in the first cycle, there was an improvement of students’ mean was 80,5. Where, 18 students who got successful score criteria above 70 or it was 86 % and 3 students who got unsuccessful score criteria above 70 or it was 14 %. . In other words, the students’ achievement at writing descriptive text was improved. And based on interview sheet, observation sheet, diary notes and documentation, it showed that the expression and excitement of the students were also improved