<![CDATA[This study was motivated by the low level of basketball passing accuracy among students in Physical Education classes at Senior High Schools in Magelang Regency, Central Java. Passing is a fundamental technical skill in basketball that significantly influences offensive organization and overall team performance. Therefore, this study aimed to examine the effect of Small-Sided Games (SSG) modifications, specifically the 2×2 and 4×4 formats, on students’ basketball passing accuracy and to compare the effectiveness of both formats. This study employed a quasi-experimental method with a Two-Group Pretest–Posttest Design. The participants were 32 tenth-grade students selected via convenience sampling and assigned to two groups using a matched-subjects procedure based on pretest scores. The intervention was conducted over eight weeks with two training sessions per week. Passing accuracy was measured using a validated basketball passing accuracy test. Data were analyzed using descriptive statistics, Shapiro–Wilk normality tests, Levene’s homogeneity tests, paired-sample t-tests, independent-sample t-tests, and Cohen’s d effect size analysis. Both SSG formats significantly improved students’ passing accuracy. In the 2×2 SSG group, the mean score increased from 8.8 to 16.6 (p < 0.001), while in the 4×4 SSG group, the mean score increased from 11.0 to 13.9 (p = 0.008). Furthermore, the independent-samples t-test revealed a significant difference between groups (t = 4.55, p < 0.001), indicating that the 2×2 format produced greater improvement than the 4×4 format. Effect size analysis also showed a large effect for the 2×2 group (d = 1.84) and a moderate-to-large effect for the 4×4 group (d = 0.77). Small-Sided Games training significantly improves basketball passing accuracy among high school students. However, the 2×2 format is more effective than the 4×4 format in enhancing individual technical performance, particularly passing accuracy, due to increased ball contacts and decision-making opportunities. Keywords: accuracy, basketball, small-sided games.]]>
