This research's objectives are to discover the factors that affect teacher's performance. The development of teacher's performance is determined by many factors, and one of them is competence, which is one of the factors that will improve performance. Certification is an important variable toward teacher's performance; accordingly, previous researches stated that certification had an impact on teacher's performance. This research was conducted to 120 respondents at Yadika 5 High School and it

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... opted the method of average cell to test the hypotheses. This research observed the background framework, specifically the influence of teacher's performance toward competencies moderated by certification. The results of this study proved that competence had an impact toward teacher's performance and certification was found as a moderating variable.