This study examines the role of self-determination in relation to the emotional well-being of high school students attending full-day schools in Samarinda City. A quantitative approach with a correlational design was employed. Data were collected using self-determination and emotional well-being scales. The sampling technique used was cluster random sampling. The senior high schools that implemented the full-day school system in each sub-district in Samarinda City were grouped and allocated proportionally into eight representative schools, resulting in 359 student respondents. The results indicated a strong and significant relationship between self-determination and emotional well-being among high school students attending full-day schools in Samarinda City, as reflected by a correlation coefficient of r = 0.613. The role of self-determination contributed 37.6% to the score in emotional well-being. These findings suggest the need for further research to explore other factors influencing emotional well-being in full-day school students. Furthermore, schools are encouraged to implement programs that enhance student self-determination to support emotional well-being.
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