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The implementation of a School-Based Management in a school might be correlated to the performance of the school principal. The aim of this research was to identify the leadership, motivation, discipline, and commitment of the school principals in implementing the School-Based Management (SBM) in State Vocational School (SMKN) 1 Al Mubarkeya and State Vocational School (SMKN) 1 of Darul Kamal, Aceh Besar Regency. A descriptive research method and a qualitative research approach were used in this study. The data were collected by doing interviews, doing observations, and collecting other relevant facts or physical evidence. The principals, the vice principals, the teachers, and the educators or staffs in the schools were the subjects of this research. The results indicate that: (1) the leadership of the principals had a crucial role in implementing SBM since the principals were the ones who made a decision or a planning regarding the eight teams who would work on the eight national education standards. It was also found that (2) the motivation was expected to be shown not only from the principal, but also from the teachers or the educators. In addition, (3) the discipline of all of the schools’ elements was affected by the discipline shown by the principal. Finally, (4) the commitment of the principals in implementing the SBM was in accordance with the planning that had been made.