This study seeks to analyze the relationship of influence of a professional learning community of school and a competency development activity in school, and the moderating effect of process-focused assessment teacher training between the two variables. Out of 「KELS 2013」, the 5th(2017) data set, the responses of 1,045 school data were analyzed excluding outliers. Descriptive statistics, correlation, simple regresssion, and hierarchical regression analysis were used to answer these questions, and SPSS Process Macro 3.5 was used to verify the moderating effect. According to the results, when all of the school members eagerly cooperated as a member of professional learning community of school focusing on students’ learning, competency development activities had more impact actively. It was confirmed that the moderating effect of process-focused assessment teacher training conducted in school adjusted the influence of professional learning community of school upon competency development activity. Based on the result, we suggested that the academic and policy implication were presented to understand and to practice vitalization of competency development in the pursuit of the 2015 revised curriculum. In particular, the concept of a professional learning community oriented to teachers needed to be extended to a professional learning community including principals, vice principals, teachers, and the teaching staff in a broad sense, and we emphasized the necessity of school management leadership, strategy, and teacher training to change the perception of school members in the perspective of practice in education.