The decision-making process of students in choosing a study program is influenced by various factors, such as tuition fees, family support, and peers. However, the role of personal interests as a mediating variable in the relationship between these factors has not been widely researched. This study aims to determine the influence of education costs, family support, and peers on the decision to choose a study program with personal interests as a mediating variable. This study examines the role of personal interests as a mediating variable that links external factors to the decision to choose a study program, providing new insights into the decision-making mechanisms of students. A quantitative approach is used with the survey method. The analysis used Partial Least Square - Structural Equation Modeling (PLS-SEM) with SmartPLS 4.0 software. The results of the hypothesis testing showed six of the seven significant relationships. Tuition fees had a positive effect on the decision to choose (t = 2.221; p = 0.026) and personal interest (t = 2.824; p = 0.005). Family support had an effect on voting decisions (t = 2.027; p = 0.043), but not on personal interests (t = 1.866; p = 0.062). Personal interest had an effect on the decision to choose (t = 2.387; p = 0.017). Peers had an effect on voting decisions (t = 2.233; p = 0.026) and personal interests (t = 2.042; p = 0.041). Family support has no effect on personal interests.
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