The purpose of this study was to determine the effect of transformational leadership and professional competence, both partially and simultaneously towards professional competence. It was also to reveal the role of work motivation as a mediating variable. The data analysis method used in the study is Structural Equation Modeling (SEM) with the Analysis of Moment Structure (AMOS) 22.0 program with the sample size of 255 respondents, taken from a population of 852. The study presented a novelty since most of the study related to competence was in large scopes of competence. This study focused on professional competence in order to get the detailed result. The conclusions are: (1) transformational leadership and professional competence have a significant effect on work motivation, (2) transformational leadership, professional competence, and work motivation have a significant effect on teachers' performance. The following results are: (1) professional competence had the most dominant effect on work motivation, (2) work motivation had the most significant effect on teachers' performance (3) Work motivation is an intervening variable on transformational leadership and professional competence in improving teachers performance. The results of this study illustrated that the professional competencies of each teacher influenced the work motivation of vocational school teachers in Bekasi. Further, the study presented implications that the improvement of teachers' performance at State Vocational Schools in Bekasi could be through enhancing their work motivation due to the significant evidence that the work motivation variable intervened in transformational leadership and also professional competence.
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