Success in learning can be seen from the teaching materials used. Teaching materials must be mastered and understood by students because they help in achieving learning objectives. Student Worksheets (LKPD) are printed teaching materials that contain tasks that must be done by students which are equipped with instructions and steps and are able to provide appeal to students. “This study aims to develop student worksheets (LKPD) based on picture story books, to determine the feasibility, practicality, and effectiveness of student worksheets (LKPD) based on picture story books to improve narrative writing skills of students at Muhammadiyah Wirobrajan I Elementary School Yogyakarta. This development research (Reserch and Development) uses the 4D model. The feasibility of LKPD by material experts obtained a percentage of 93% with a very feasible category, by media experts obtained a percentage of 94.3% with a very feasible category. practicality by teachers in field trials obtained a percentage of 91.67% with a very practical category, practicality of LKPD by students in field trials obtained a percentage of 94.28% with a very practical category. The effectiveness of LKPD in the implementation of learning in the field trial obtained a percentage of 90.48% with a very effective category, learning activities in the field trial obtained a percentage of 86.39% with a very effective category. The effectiveness of LKPD in the field trial obtained an average pretest of 60.42 and the postest increased to 85.68. The paired sample t-test on the results of the field trial obtained a sig value (2-tailed) of 0.000 <0.05 which means that LKPD is effective in improving students' narrative writing skills.”
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