The objective of this research is to investigate whether the students taught using project based learning better writing skill than the students taught by non project based learning. In order to achieve the objective of research The subject of the research is the student at the second grade of Sosial Class of SMAN 1 Ngadiluwih. The research design is quasi experimental design. It is done by comparing two class, experimental and control group. Every group consist of 32 and 36 students. The experimental class is conducted at X of social (II) 2 taught using project based learning and control class is conducted at Y of social (I) 1 taught using non project based learning. In this study, the researcher gave pre-test and post-test. Then, the result of the test was calculted by using ANCOVA through SPSS 21.0 In the result of post-test in experimental group is 4,236 higher than control group, and the result of the significant value is 0,034(0,034<0,050). It means that the null hypothesis (H0) was rejected and the alternative hypothesis (Ha) was accepted. Therefore the using project based learning is more effective to improve the students writing in personal letter tha convensional method.

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