Abstract

• The main purpose of the study is to study the effectiveness of collaborative learning for developing the writing skill in English of high school students. The effectiveness of collaborative learning in English teaching was tested in two high schools in Mandalay Region. The design adopted in this study was one of the true experimental designs, namely, the pretest-posttest control group design. The students from two sample schools from Mandalay Region were selected by simple random sampling method. The randomly assigned experimental group (n=60) was instructed based on collaborative learning and the control group (n=60) was taught by traditional method. The instruments used in this study were a pretest and a posttest. Research findings proved that collaborative learning has positively contributed to the improvement of English teaching at the high school level and could reinforce the improvement of the students' writing skill.