This study aims to improve underhand passing skills in volleyball through the application of the cooperative learning model, Student Team Achievement Division (STAD), for Grade X B students of SMA Negeri 1 Kayan Hilir, Sintang Regency. The research method used was Classroom Action Research (CAR) with the Kemmis and McTaggart model, consisting of planning, action, observation, and reflection stages. The subjects of the study were 32 students of Grade X B. The instruments used included an underhand passing skills test, observation sheets, and documentation. Data were analyzed descriptively and quantitatively by calculating the percentage of students’ learning mastery at each cycle. The results of the study showed that students’ underhand passing skills in volleyball improved from the pre-cycle stage of 20% at the initial condition to 43% at the end of cycle I, and further increased to 86% at the end of cycle II. The target achievement indicator in cycle II was set at 75%. Based on the students’ learning outcomes, the percentage of learning mastery reached 75%, which means the target in cycle II was achieved. It can be concluded that the implementation of the cooperative learning model, STAD, is effective in improving students’ underhand passing skills in volleyball.
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