Employees are the most important part to achieve the goals of a company or organization. So that the company runs effectively and efficiently, the company needs employees who are in accordance with the principle of "the right man in the right office". To achieve the goals of the company or organization, the first step taken is to recruit prospective employees according to the qualifications of the company or organization, which will improve employee performance results while in a company or organization.

The purpose of this study is to determine whether or not there is an influence of a principal's leadership and work discipline on the performance of a teacher at SMP Negeri 8 Padang. This research includes qualitative research in the form of case studies. Those appointed as resource persons are teachers and school principals, whose data is taken by conducting observations, interviews, and documentation. The results obtained from this study are 1) The principal's leadership style acts in teacher performance. The effectiveness of a principal's leadership style can motivate teacher performance in schools, 2) Work discipline plays an important role for teacher performance, because whether or not the teacher's discipline attitude will make teachers have the will to comply with the rules that have been made by the school, and 3 ) Teacher performance and work discipline can increase if the leadership style of a school principal is effective. So the interaction between the principal's leadership style and work discipline affects the performance of teachers in schools.

Based on the pre-survey in the field, it is shown that the pedagogical competence of Padang City Junior High School teachers is still not optimal. It is suspected to have something to do with implementing the principal's supervision and the teachers' work ethic. Therefore, it is necessary to conduct research to test its validity. This study aims to reveal the contribution of the implementation of principal supervision and work ethic to the pedagogical competence of Padang City Junior High School teachers. The hypotheses proposed in this study are: (1) the implementation of principal supervision contributes to teacher pedagogical competence, (2) work ethic contributes to teacher pedagogical competence, and (3) implementation of principal supervision and cooperation ethos contributes to teacher pedagogical competence. The population in this study were all-state junior high school teachers in the city of Padang, totalling 1,099 people. The research sample of as many as 220 people was taken with a cluster random sampling technique based on the highest national exam results (UN), moderate to the lowest (2019 UN results). The research instrument used is a rating scale and a Likert Scale model questionnaire that has been tested for validity and reliability. The research data were analyzed by correlation and regression techniques. The results of data analysis show that: (1) the implementation of principal supervision contributes to teacher pedagogic competence by 41%, (2) work ethic contributes to teacher pedagogic competence by 52.4%, and (3) implementation of principal supervision and cooperation ethic. Equally, contribute to the pedagogic competence of teachers by 68.5%. The level of achievement of the teacher's pedagogic competence score of 86.71% is in the capable category. For the implementation of principal supervision, 87.63% is in a suitable category, while for the teacher's work ethic, 86.70, the ideal score is in the high category. The above findings imply that the implementation of principal supervision and work ethic are two factors that can improve teachers' pedagogic competence, in addition to other factors.