Although many studies have examined school leadership, few have specifically explored the implementation of leadership in private vocational high schools, particularly regarding performance improvement strategies and their relation to teacher development and educational quality. This study analyzes the principal's leadership in improving school quality through performance enhancement. A qualitative case study method was employed, using observation, interviews, and documentation techniques. Data were analyzed through reduction, presentation, and conclusion drawing, and validated through source triangulation. The results show that the principal of PAB 8 Sampali Private Vocational High School plays a strategic role as a leader, manager, and motivator in enhancing educational quality. He effectively manages resources, implements innovations such as the “Work, Study, Entrepreneurship” program, motivates teachers, and fosters collaboration to create a conducive learning environment. Despite challenges such as policy changes and diverse student characteristics, these were addressed through teacher training and strategic adjustments. His leadership has had a significant positive impact, as evidenced by the school’s accreditation improvement from grade C to A, increased student enrollment, and enhanced achievements. Implementing the Eight National Education Standards has strengthened school quality and fulfilled stakeholder expectations. Conclusion: The principal’s leadership effectively improves educational quality through innovation, sound management, and the ability to adapt to various challenges.

The principal's leadership is key in achieving the school's vision, mission, and goals through well-planned and gradual programs. This study examines the principal's role in shaping student discipline at Bina Siswa Private Middle School. The research method used is a case study approach with data collection techniques through observation, interviews, and documentation. The results: the principal plays a crucial role in shaping student discipline by establishing and enforcing rules that promote positive behaviour and prevent negative actions, creating a conducive learning environment. As a leader, the principal sets an example by being punctual and organising programs to improve student behaviour, such as extracurricular activities and character-building initiatives. As a supervisor, the principal conducts classroom observations and home visits to ensure consistent discipline and monitor student development. Internal and external factors influence student discipline, including family, school, and the community. Although discipline fosters a productive environment, excessive strictness may cause stress, requiring a personalized educational approach. In conclusion, the principal's leadership is vital in shaping the discipline character at school.

The role of the madrasa head as supervisor has been to try to support teacher professionalism through planning supervision programs, implementing and following up on the results of supervision evaluations, but up to now there are still teachers who do not understand the tasks that must be fulfilled by a teacher. This research aims (1) to determine the role of the madrasa head in improving the professionalism of teachers at MTSN 2 Medan, (2) to determine the implementation of the role of the madrasa head in improving the professionalism of teachers at MTSN 2 Medan. This research uses a qualitative approach with the case study method. There were 3 informants in this research, namely the Head of Madrasah, Deputy Head of Madrasah I, Head of Administration and also Teachers. Data collection techniques use observation, interviews and documentation. Data validity techniques use triangulation. The research results in this study are the role of the Madrasah Head at MTsN 2, through a clear vision, inclusive approach, comprehensive professional development program, use of data in decision making, and prioritization of student welfare, has succeeded in creating a school environment that is conducive to improving quality. education and teacher professionalism. The innovations carried out by the Madrasa Head at MTsN 2 have succeeded in improving the professionalism of teachers and staff, as well as the overall quality of education.