<![CDATA[This research aims to investigate the performance of certified teachers using multisource feedback through multivariate data analysis. The researchers distributed an online 5-point Likert scale questionnaire. A total of sixty-one public elementary schools consented to participate in this study, with each school being represented by its principal, a group of teachers, and a cohort of students. The researchers conveniently chose a group of fellow teachers and students to avoid the school principals intervention. This study showed the covariance among school principals, fellow teachers, and students assessments. The findings in this study included the significant difference between students and teachers in the performance of certified teachers subject mastery. In contrast, the school principals indicated a similar perception to that of their fellow teachers. This study confirms that students gave an average score to teachers subject mastery, although the school principals and fellow teachers assessed it to be very good. Thus, a teacher certification program is expected to contribute to the teachers professionalism and the students excellence. A teacher certification program is anticipated to enhance the professionalism of teachers, particularly those specializing in English education. An individual possessing a high level of professional expertise is indispensable for the facilitation of quality education and learning.]]>
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