Development of Teaching Material for Table Tennis Game for Knockout Serve to Improve the Serve Basic Skills of Eleventh Grade Students of SMA Negeri 2 Pasarwajo, Buton Regency

This study aims to develop, evaluate the feasibility, and measure the effectiveness of teaching materials in improving basic service skills in grade XI students at SMA Negeri 2 Pasarwajo, Buton Regency. The type of research used is research and development (R&D) with a 4-D model approach, which includes the stages of Define, Design, Develop, and Disseminate. The validation process was carried out by three expert lecturers, consisting of two material experts and one media expert. A small-scale trial involved 30 grade XI students of SMA Negeri 2 Pasarwajo who were selected using a random sampling technique. Data analysis techniques used included quantitative and qualitative analysis. The results of the study showed that: 1) The development of teaching materials for knockout serve table tennis was carried out through four stages, namely defining, designing, developing, and disseminating. 2) The feasibility of the teaching materials was assessed as very good based on assessments from material and media experts, with an average score of 4.42 and a percentage of 88.43%. Meanwhile, a small-scale trial on students showed a very feasible category, with an average score of 4.61 and a percentage of 92.31%. 3) The effectiveness test using a paired sample t-test showed a value of -47.677, which indicates a significant difference between the pretest and posttest scores. Thus, the knockout service table tennis teaching material is declared feasible and effective for use in improving the basic service skills of class XI students at SMA Negeri 2 Pasarwajo, Buton Regency.