Policy evaluation was introduced in Japan in the late 1990s. According to the guidelines of the Ministry of Internal Affairs and Communications（2001）, policy evaluation has three purposes.（1）To make public administration accountable to the people,（2）to realize efficient and high-quality administration and（3）to shift to results-oriented administration. In order to consider the stable operation of policy evaluation with these purposes, the study of public administration tried to interpret policy evaluation from the perspectives of administrative responsibility theory, administrative management theory, and NPM theory. However, interpretations are difficult. Here, I would like to look back on the history of the efforts of public administration and consider why policy evaluation has been reexamined from 2021. The purpose of this paper is to explore the conditions for successful reexamination of policy evaluation in practice.

  The Ministry of Education of the Republic of the Union of Myanmar has begun to deploy language assistants, so called TAs（Teaching Assistants）, as temporary teachers in schools throughout the country in order to improve the scholastic achievements of ethnic minorities whose home language is not the Myanmar language. TAs are not in charge of teaching specific subjects, but they provide various kinds of linguistic learning support, especially in the lower grades of primary school courses.

  In order to examine whether this TA placement policy was effective, several analyses were conducted. It was shown that the number of TAs relative to the total number of students could significantly explain the completion examination results of the fifth-grade in the primary school courses by regressing the completion examination results to various factors including the relative number of TAs in the 2018 school year. Furthermore, it was found that the higher the relative number of TAs, the higher the inter-grade transition rates of the primary school courses, which indicated that the TA placement policy was effective.