This thesis investigated the effect of locus of control on the human capital investment decision of the students. Locus of control measures the extent to which people feel that they have control over their future outcomes. This relation has been investigated through the use of a survey of 15-year old students in Dutch secondary schools. Furthermore, possible antecedents of locus of control have been investigated. The results indicate that locus of control has a strong effect on the human capital investment decision.