This study aims to improve the writing skills of students in class XI MIPA in 2 SMAN 7 Kediri through picture series. The researcher chose one of the teachers as collaborators to observe and fill in the notes column when the researcher teaches during the research. The objective of the study to know how picture series can improve students’ ability in writing explanation text through Picture Series. Classroom Action Research serves as a tool to investigate as well solve problems that arise in the classroom as well as tools for in-service training, where teachers use skills and new methods and sharpening his analytical skills with several media that have the aim of solving problems in the classroom. CAR is carried out through a cycle consisting of four stages, starting with planning the action, continuing with the action learning and observation activities and ends with a reflection for study and analyze data obtained through action. This research was conducted in one cycle, the criteria of success if 80% of students score above the KKM 75 and with an average score of at least 80. Data were collected from observations, tests, and documentation. Based on initial observations, there are several problems in the teaching and learning process of writing. They deal with students writing skills related to student participation, motivation, ability to generate and develop ideas, vocabulary, grammar, sentence structure, punctuation, and capitalization. The solution to this problem is to apply a series of pictures with various tasks in the teaching and learning process. The findings in this study found that the use of picture series significantly improved students writing skills. This can be seen from the average in preliminary test score was 61.75 and the cycle test score of 80.62, increasing to 18,87 based on the criteria of success above, this research considered as successful. This research shows that therefore, using picture series can improve students writing skills.

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