Speaking is one of the most difficult areas of EFL students and despite the common knowledge of storytelling as a useful tool, there is little research on the particular effects of storytelling on fluency, accuracy, and understanding in junior high schools in Indonesia. The purpose of the study is to examine how eighth-grade students at SMP Kristen Bala Keselamatan Palu are influenced in terms of speaking ability by storytelling. The quasi-experimental design was applied, which included pre-test and post-test control groups, 60 students were used in the study and were chosen using the cluster random sampling technique, 30 students were assigned the experimental group and 30 students were assigned the control group. Oral speaking tests were used to gather data which were rated using an analytical rubric and the outcomes showed that the experimental group had a higher mean gain score (4.17) than the control group (1.97) with a significant difference (p < 0.05) and large effect size (Cohen d = -1.10). These results suggest that storytelling can be not only statistically, but also pedagogically significant, as it promotes fluency, confidence, and general communicative proficiency of students in EFL classrooms.
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