Improving Students’ Critical Thinking In Writing Through Group Investigation Strategy Assisted By Digital Story Board Media

This study dealt with the implementation of group investigation strategy assisted by digital story board media on the students’ critical thinking in writing. The objective of the study was to find out the students’ improvement in critical thinking by applying group investigation strategy assisted by digital story board media. This study was conducted at SMA Al-Hikmah Medan in tenth grade students academic year 2019/2020. The sample was taken by applying purposive sampling technique. The number of subject in this research was 33 students. The method of the research applied classroom action research. The instrument of the reserach used observation sheet and essay test. The researcher conducted two cycles in this research, there were two meetings in cycle I and two meetings in cycle II. This research used quantitative and qualitative data. The quantitative data showed that the mean in cycle I was 70.90, the mean score in cycle II was 83.33; the students who got more than 75 in cylce I was 20 students and the percentage was 60.6%, the students who got more than 75 was 26 students and the percentage was 78.79%. The qualitative data got from observation sheet in every cycle showed that the improvement of the teacher and the students’ behavior. Based on the results from quantitative and qualitative data proved that group investigation strategy assisted by digital story board media improved the students’ critical thinking in writing