This study is to develop a measurement tool named T-PEC(Teacher’s Process-centered Evaluation Competency) which helps teachers understand and practice process-centered evaluation. Researchers analyzed literatures related to process-centered evaluation, and developed a draft version of a measurement tool that secured content validity after discussing with three researchers, one principle teacher of process-centered evaluation, three teachers and three professors, and then executed Exploratory Factor Analysis(EFA)/confirmative Factor Analysis(CFA) based on the survey result of 130 teachers, and finally developed a measurement tool which consists of 20 questions with securing model fit, convergent validity, discriminant validity, and reliability. The measurement tool may help process-centered evaluation become a reality by making the abstractness of process-centered evaluation more concrete and by increasing teacher’s understanding and application of process-centered evaluation. In addition, it is expecting that teachers can diagnose and analyze the competency of process-centered evaluation by themselves, thus contributing to feedback of teacher’s evaluation ability. This study suggests that developed measurement tool can be used to check differences in the competency of process-centered evaluation by region, school-level, specific subject, teacher’s career, gender, and can be used to develop training programs to help teachers improve their ability to conduct process-centered evaluation.